G‑d said to Abram: "Leave your land, your birthplace and your father's house, and go to the land I will show you" (Genesis 12:1)

These words are among the most consequential in the history of mankind. With them a new faith was born that has lasted for two-thirds of the course of civilization and remains young and vigorous today. Not only did Abraham give rise to what today we call Judaism. He was also the inspiration of two other religions, Christianity and Islam, both of which trace their descent, biological or spiritual, to him, and which now number among their adherents more than half the six billion people on the face of the earth.

There was no one like Abraham, yet the Torah is exceptionally understated in its account of him. As children we learned that he was the first iconoclast, the person who, while still young, broke the idols in his father's house. But this is a midrash, a tradition, inferred from hints in the biblical text rather than from explicit statement. Abraham does not fit any conventional image of the religious hero. He is not, like Noah, the sole survivor of a world hastening to its destruction. He is not, like Moses, a law-giver and liberator. He is not, like the later prophets, a man who spends his life confronting kings, wrestling with his contemporaries and "speaking truth to power."

To be sure, he is a man of exemplary virtue. He welcomes strangers and gives them food. He fights a battle on behalf of the Cities of the Plain in order to rescue his nephew Lot. He prays for them in one of the greatest dialogues in religious literature. He patiently waits for a child and then, when the command comes, is willing to offer him as a sacrifice, only to discover that the G‑d of truth does not want us to sacrifice our children but to cherish them. But if we were asked to characterise him with adjectives, the words that spring to mind - gentle, kind, gracious - are not those usually associated with the founder of a new faith. They are the kind of attributes to which any of us could aspire. None of us can be an Abraham, but all of us can take him as a role model. Perhaps that is the deepest lesson of all.

In Sincerity and Authenticity, Lionel Trilling made the following comment:

Not all cultures develop the idea of the heroic. I once had occasion to observe in connection with Wordsworth that in the rabbinical literature there is no touch of the heroic idea. The rabbis, in speaking of virtue, never mention the virtue of courage, which Aristotle regarded as basic to the heroic character. The indifference of the rabbis to the idea of courage is the more remarkable in that they knew that many of their number would die for their faith. What is especially to our point is that, as ethical beings, the rabbis never see themselves — it is as if the commandment which forbade the making of images extended to their way of conceiving the personal moral existence as well.

Trilling is not quite accurate. The rabbis did speak of courage, gevurah. But he is right to say that that Judaism did not have heroes in the way the Greeks and other cultures did. A hero is one convinced of his own importance. He or she is conscious of playing a part on the world stage under the admiring gaze of their contemporaries. The rabbis, said Trilling, "would have been quite ready to understand the definition of the hero as an actor and to say that, as such, he was undeserving of the attention of serious men."

Abraham is the paradigm of an unheroic hero, one who (in Maimonides' lovely phrase) "does what is right because it is right" and not for the sake of popularity or fame. If we were to define Judaism in Abrahamic terms it would be the heroism of ordinary life, being willing to live by one's convictions though all the world thinks otherwise, being true to the call of eternity, not the noise of now.

Which brings us to the key phrase, the first words of G‑d to the bearer of a new covenant: Lech Lecha. Is there, already in these two words, a hint of what was to come?

Rashi, following an ancient exegetical tradition, translates the phrase as "Journey for yourself." According to him what G‑d meant was "Travel for your own benefit and good. There I will make you into a great nation; here you will not have the merit of having children." Sometimes we have to give up our past in order to acquire a future. G‑d was already intimating to Abraham that what seems like a sacrifice is, in the long run, not so. Abraham was about to say goodbye to the things that mean most to us — land, birthplace and parent's home, the places where we belong. It was a journey from the familiar to the unfamiliar, a leap into the unknown. To be able to make that leap involves trust — in Abraham's case, trust not in visible power but in the voice of the invisible G‑d. At the end of it, however, Abraham would discover that he had achieved something he could not have done otherwise. He would give birth to a new nation whose greatness consisted precisely in the ability to live by that voice and create something new in the history of mankind. "Go for yourself."

Another interpretation, more midrashic, takes the phrase to mean "Go with yourself" - meaning, by travelling from place to place you will extend your influence not over one land but many:

When the Holy One said to Abraham, "Leave your land, your birthplace and your father's house..." what did Abraham resemble? A jar of scent with a tight-fitting lid put away in a corner so that its fragrance could not go forth. As soon as it was moved from that place and opened, its fragrance began to spread. So the Holy One said to Abraham, "Abraham, many good deeds are in you. Travel about from place to place, so that the greatness of your name will go forth in My world."

Abraham was commanded to leave his place in order to testify to the existence of a G‑d not bounded by place — Creator and Sovereign of the entire universe. Abraham and Sarah were to be like perfume, leaving a trace of their presence wherever they went. Abraham and Sarah were to be like perfume... leaving a trace of their presence wherever they went Implicit in this midrash is the idea that the fate of the first Jews already prefigured that of their descendants. They were scattered throughout the world in order to spread knowledge of G‑d throughout the world. Unusually, exile is seen here not as punishment but as a necessary corollary of a faith that sees G‑d everywhere. Lech Lecha means "Go with yourself" - your beliefs, your way of life, your faith.

A third interpretation, this time more mystical, takes the phrase to mean, "Go to yourself." The Jewish journey, said R. David of Lelov, is a journey to the root of the soul. Only in the holy land, said R. Ephraim Landschutz, can a Jew find the source of his or her being. R. Zushya of Hanipol said, "When I get to heaven, they will not ask me, Zushya, why were you not Moses? They will ask me, Zushya, why were you not Zushya?" Abraham was being asked to leave behind all the things that make us someone else — for it is only by taking a long and lonely journey that we discover who we truly are. "Go to yourself."

There is, however, a fourth interpretation: "Go by yourself." Only a person willing to stand alone, singular and unique can worship the G‑d who is alone, singular and unique. Only one able to leave behind the natural sources of identity can encounter G‑d who stands above and beyond nature. A journey into the unknown is one of the greatest possible expressions of freedom. G‑d wanted Abraham and his children to be a living example of what it is to serve the G‑d of freedom, in freedom, for the sake of freedom. What does this mean?

Alasdair Macintyre once pointed out that there are two kinds of atheist: one who does not believe in G‑d, and one for whom atheism itself is a kind of religion. Of the latter, some of the greatest examples were (lapsed, converted, or non-believing) Jews — most famously, Spinoza, Marx and Freud. Instead of merely denying the truths of Judaism, they set out to provide systematic alternatives.

Fundamental to the Torah are two freedoms: the freedom of G‑d and the freedom of human beings. G‑d is not, in Judaism, an impersonal force. He acts (in creation, revelation and redemption) not on the basis of necessity but of choice. In choosing to make mankind in His own image he endowed us, too, with choice. There is no such thing as fate or predestination. "I call heaven and earth to witness," said Moses, "that I have set before you life and death, blessing and curse. Therefore choose life."

It was this that Spinoza, Marx and Freud set out to challenge. Each sought to show that we are not free. Man is a predictable animal. Our nature and character are subject to quasi-scientific laws. There is a science of human behaviour as there is a science of atoms. History, personal or collective, is a form of inevitability. We are what we are because we could not be otherwise. Against this, Judaism is a living protest. Abraham and his children were summoned to a life of radical freedom - and it is this that is at the heart of G‑d's threefold call.

Marx said that man is a product of social forces, themselves shaped by the interests of the ruling class, the owners of property of which the most significant is land. Therefore G‑d said to Abraham, Leave your land.

Spinoza said that man is made by innate instincts and biological drives (nowadays this is called genetic determinism) given by birth. Therefore G‑d said to Abraham, Leave the circumstances of your birth.

Freud said that we are the way we are because of the traumas of childhood, the influence of our early years, our relationships and rivalries with our parents, especially our father. Therefore G‑d said to Abraham, Leave your father's house.

Lech Lecha means: Leave behind you all that makes human beings predictable, unfree, able to blame others and evade responsibility. Abraham's children were summoned to be the people that defied the laws of nature because they refused to define themselves as the products of nature (Nietzsche understood this aspect of Judaism particularly well). That is not to say that economic or biological or psychological forces have no part to play in human behaviour. They do. But with sufficient imagination, determination, discipline and courage we can rise above them. Abraham did. So at most times did his children.

Those who live within the laws of history are subject to the laws of history. Whatever is natural, said Maimonides, is subject to disintegration and decay. That is what has happened to virtually every civilization that has appeared on the world's stage. Abraham, however, was to become the father of an am olam, an eternal people that would neither disintegrate nor decay. Therefore it had to be a people willing to stand outside the laws of nature. What for other nations are natural — land, home, family — in Judaism are subjects of religious command. They have to be striven for. They involve a journey. They are not given at the outset, nor can they be taken for granted. Abraham was to leave behind the things that make most people and peoples what they are, and lay the foundations for a land, a Jewish home and a family structure responsive not to economic forces, biological drives and psychological conflicts but to the word and will of G‑d.

Lech Lecha in this sense means being prepared to take an often lonely journey: "Go by yourself." To be a child of Abraham is to have the courage to be different, to challenge the idols of the age, whatever the idols and whichever the age. In an era of polytheism, that meant seeing the universe as the product of a single creative will - and therefore not meaningless but coherent, meaningful. In an era of slavery it meant refusing to accept the status quo in the name of G‑d, but instead challenging it in the name of G‑d. When power was worshipped, it meant constructing a society that cared for the powerless, the widow, orphan and stranger. During centuries in which the mass of mankind was sunk in ignorance, it meant honouring education as the key to human dignity and creating schools to provide universal literacy. When war was the test of manhood, it meant striving for peace. In ages of radical individualism like today, it means knowing that we are not what we own but what we share; not what we buy but what we give; that there is something higher than appetite and desire - namely the call that comes to us, as it came to Abraham, from outside ourselves, summoning us to make a contribution to the world.

Jews, wrote the non-Jewish journalist Andrew Marr, "really have been different; they have enriched the world and challenged it." It is that courage to travel alone if necessary, to be different, to swim against the tide, to speak in an age of relativism of the absolutes of human dignity under the sovereignty of G‑d, that was born in the words Lech Lecha. To be a Jew is to be willing to hear the still, small voice of eternity urging us to travel, move, go on ahead, continuing Abraham's journey toward that unknown destination at the far horizon of hope.