Positive Commandment 3 (Digest)
"And you shall love the L-rd, your G-d"—Deuteronomy 6:5.
We are commanded to love G-d. We foster a love for G-d by studying and contemplating His Torah, His commandments, and His awesome deeds. Through studying and meditating about G-d we come to have somewhat of an understanding of His greatness—which automatically spawns a deep love for Him.
This mitzvah also includes sharing our knowledge of G-d with others, and calling upon our fellows to serve Him. After all, if we love G-d, we’d surely sing His praises before all who are ready to hear.
Positive Commandment 4 (Digest)
"You shall fear the L-rd, your G-d"—Deuteronomy 6:13.
We are commanded to fear G-d; never to be complacent, and to always bear in mind that transgressing His will leads to divine retribution.
This is also why we never say G-d’s Name in vain, meaning, not in the context of a prayer or blessing – for this diminishes the fear and reverence we are commanded to harbor for Him.
Positive Commandment 9 (Digest)
Sanctifying G-d's Name
"And I will be sanctified among the Children of Israel"—Leviticus 22:32.
We are commanded to sanctify G-d’s holy Name by publicly proclaiming our faith and religion. In the event that a tyrant attempts to coerce us to renounce our belief in G-d, we are commanded to refuse to comply—even if the tyrant threatens to kill us. We may not even verbally deny our belief in G-d, though in our hearts we remain true to Him.
Translation of (the unabridged text of) Sefer Hamitzvot by Rabbi Berel Bell, member of the Rabbinical Court of Montreal and director of Teacher Training for the Jewish Learning Institute.
From "Sefer Hamitzvot in English," published by Sichos in English