A person should direct his heart and the totality of his behavior to one goal, becoming aware of God, blessed be He. The [way] he rests, rises, and speaks should all be directed to this end.
For example: when involved in business dealings or while working for a wage, he should not think solely of gathering money. Rather, he should do these things, so that he will be able to obtain that which the body needs - food, drink, a home and a wife.
Similarly, when he eats, drinks and engages in intimate relations, he should not intend to do these things solely for pleasure to the point where he will eat and drink only that which is sweet to the palate and engage in intercourse for pleasure. Rather, he should take care to eat and drink only in order to be healthy in body and limb.
Therefore, he should not eat all that the palate desires like a dog or a donkey. Rather, he should eat what is beneficial for the body, be it bitter or sweet. Conversely, he should not eat what is harmful to the body, even though it is sweet to the palate. For example: a person with a warm constitution should not eat meat or honey, nor drink wine, as Solomon has stated in a parable: The eating of much honey is not good (Proverbs 25:27). One should drink endive juice, even though it it bitter, for then, he will be eating and drinking for medical reasons only, in order to become healthy and be whole - for a man cannot exist without eating and drinking.
Similarly, he should not have intercourse except to keep his body healthy and to preserve the [human] race. Therefore, he should not engage in intercourse whenever he feels desire, but when he knows that he requires a seminal emission for medical reasons or in order to preserve the [human] race.