There was another incident involving one gentile who came before Shammai and said to Shammai: Convert me on condition that you teach me the entire Torah while I am standing on one foot. Shammai pushed him away with the builder’s cubit in his hand. This was a common measuring stick and Shammai was a builder by trade. The same gentile came before Hillel. He converted him and said to him: That which is hateful to you do not do to another; that is the entire Torah, and the rest is its interpretation. Go study.

The straight path is the mean disposition found in each and every tendency of all the human tendencies. Such tendency is removed from both extremes an equal distance, and is not nearer to one than to the other. Therefore have the wise men of yore commanded that man should ever review his tendencies, (Sotah, 5b. C.) estimate them, and direct them toward the middle-path so that he will be sound in body. How may one do it? He should not be an excitable person, easily angered; nor like the dead without feelings, but adopt a middle-course, not to become indignant, save only at something big which is worthy enough to be angry at, so that the like should not be done another time. Likewise shall he not crave for aught save the things which the body requires, and without which it is impossible to be, as the subject is spoken of: "The righteous eateth to the satisfying of his soul" (Pro. 13.25). Likewise shall he not continue to fatigue himself in his affairs, save to acquire what is necessary for him to live on for the time being as the subject is mentioned, saying: "A little that a righteous man hath is better" (Ps. 47.16). He should not be too close-fisted, nor yet squander his money, but give tzedakah within the means of his hand, and lend accordingly to the needy. He should not be too optimistic and playful, nor too pessimistic and mournful, but spend all of his days in good cheer and with a pleasant countenance. So should he measure all the rest of his tendencies. And this path is the path of the wise men. Every man whose tendencies are mean tendencies of the middle-course, is called wise.

And how may their cure be? He who is of a hot temperment should be taught to demean himself this wise: If he be smitten and cursed, he must not feel the insult at all. and follow this way a long time until anger will be completely rooted out from his heart. And he who was arrogant should accustom himself to a life of extreme self-abasement by occupying the lowermost seat of everybody, and dress in such rags which shame those that wear them, and do such in like matters until the haughtiness of his heart will be rooted out of him, when he will return to the middle-way, which is the good way. But when he will return to the middle-way he should follow it throughout his lifetime. And this line he should follow in all the rest of his tendencies; if he had distanced himself to the extreme point of one he should remove himself to the extreme end of the other and follow it up a long time until he may return to the good way, which is the middle-standard in each and every tendency.

Rabbi Nachman said in Rabbi Samuel's name: 'Behold, it was good' refers to the Good Desire; 'And behold, it was very good' refers to the Evil Desire. (It only says 'very good' after man was created with both the good and bad inclinations, in all other cases it only says 'and God saw that it was good') Can then the Evil Desire be very good? That would be extraordinary! But without the Evil Desire, however, no man would build a house, take a wife and beget children; and thus said Solomon: 'Again, I considered all labour and all excelling in work, that it is a man's rivalry with his neighbour.' (Ecclesiastes 4:4).

My son, heed the discipline (mussar) of your father, And do not forsake the instruction (Torah) of your mother;

(6) Greater is learning Torah than the priesthood and than royalty, for royalty is acquired by thirty stages, and the priesthood by twenty-four, but the Torah by forty-eight things. By study, Attentive listening, Proper speech, By an understanding heart, By an intelligent heart, By awe, By fear, By humility, By joy, By attending to the sages, By critical give and take with friends, By fine argumentation with disciples, By clear thinking, By study of Scripture, By study of mishnah, By a minimum of sleep, By a minimum of chatter, By a minimum of pleasure, By a minimum of frivolity, By a minimum of preoccupation with worldly matters, By long-suffering, By generosity, By faith in the sages, By acceptance of suffering. [Learning of Torah is also acquired by one] Who recognizes his place, Who rejoices in his portion, Who makes a fence about his words, Who takes no credit for himself, Who is loved, Who loves God, Who loves [his fellow] creatures, Who loves righteous ways, Who loves reproof, Who loves uprightness, Who keeps himself far from honors, Who does not let his heart become swelled on account of his learning, Who does not delight in giving legal decisions, Who shares in the bearing of a burden with his colleague, Who judges with the scales weighted in his favor, Who leads him on to truth, Who leads him on to peace, Who composes himself at his study, Who asks and answers, Who listens [to others], and [himself] adds [to his knowledge], Who learns in order to teach, Who learns in order to practice, Who makes his teacher wiser, Who is exact in what he has learned, And who says a thing in the name of him who said it. Thus you have learned: everyone who says a thing in the name of him who said it, brings deliverance into the world, as it is said: “And Esther told the king in Mordecai’s name” (Esther 2:22).