(1) Let no man say: "Behold, I perform the precepts of the Torah, and engage myself in its wisdom so that I will receive all the blessings described therein, or so that I will merit the life in the World to Come; and I will separate myself from the transgressions against which the Torah gave warning so that I will escape the curses described therein, or so that I will suffer excision from the life in the World to Come". It is improper to serve the Lord in such way, for whosoever serves the Lord in such way, he is a worshiper because of fear, which is neither the degree of the prophets nor the degree of the sages. And the Lord should not be worshiped that way, save only by ignorant men, women and infants who are trained to worship because of fear, until their knowledge increases when they will worship because of love.
(2) The worshiper because of love, engages himself in the study of the Torah and the observance of precepts and follows the paths of wisdom on no account in the world, neither for fear of evil nor in order to inherit the good; but he does the true thing because it is true, and in the end the good comes because thereof. That degree is a great degree, indeed and not every scholar attains it; for such was the degree of Abraham our father, whom the Holy One, blessed is He! called His beloved, because he worshiped not, save because of love, and it is, furthermore, the degree concerning which the Holy One, blessed is He! commanded through Moses, saying: "And thou shalt love the Lord thy God" (Deut. 6.5); for, when man will love the Lord with a proper love, he will momentarily perform all of the commandments because of love.
(3) And what is the proper love? He shall love the Lord with an exceeding great and very strong love so that his soul be tied to the love of the Lord, finding himself in a constant tremor, as if he were suffering of lovesickness, when his mind is free because of love for that woman, being continuously agitated about her, whether he sitting down, or whether he is standing up, even when he is eating and drinking. More than this should the love for the Lord be in the heart of those who love him, meditating therein constantly, even as He commanded us: "With all thy heart and with all thy soul" (Ibid.). This is what Solomon allegorically said: "For I am love-sick" (Songs 2.5). And, the whole book, Song of Songs, is an allegory on this subject.