This is as Baal HaSulam explained what our sages said about the verse, “who will not lift up the face or take a bribe,” etc., that they are strict on themselves even as much as an olive and as an egg, he said, “as much as an olive,” like the dove that said, “I would prefer my nourishments to be as bitter as an olive from the hand of the Creator,” etc.

“As much as an egg,” although a chick comes out of the egg, an animal, while it is still an egg, it has no life. Still, they were strict, although the rule “and you shall eat, and be satiated, and bless,” meaning eating that is satiating, this is called “happy with his share.”

However, with this quality, he will remain in his Katnut [smallness/infancy] and will have no need for the Torah, since the Torah is required for the evil inclination, as in “I have created the evil inclination; I have created the Torah as a spice.” Hence, there is the left side, which is introspection as to the greatness of the reason that obligates him to Torah and Mitzvot [commandments], and what reward he expects in return for these works, and how much understanding he has in the true Torah and Mitzvot.

At that time, he sees only negativity and not positivity. He should include that negativity in the right [side] and settle for little and be happy with his share as though he had a satiating meal.

It follows that the left always brings him diminution so as to know what to install into the right and settle for little. Through both of them, we achieve the middle line. This is called “Father gives the white,” for he is always in a state of “white,” without any deficiencies, since he is happy with his share.

“Mother gives the red,” meaning that he is not as he should be, but only red. This is the quality of Esau, called “red.” At that time, the Creator, who is called “middle line,” gives the soul, and then he is rewarded with the quality of Torah.