on the weekly Torah portion
And G-d created the great sea-monsters (Gen. 1:21)
As Rashi notes, these were “the Leviathan (livyatan) and its mate." As explained by Chasidut, the Hebrew word "livyatan" means connection or joining. It refers to the very highest spiritual level, at which a person's attachment to G-d is constant and uninterrupted. Nonetheless, even on this superior level, every individual still needs a "mate," a good friend and supporter to help him in his service of G-d. (Likutei Sichot)
And G-d saw everything that He had made, and behold, it was very good (Gen. 1:31)
Our Sages commented: "'Good' refers to the good inclination; 'very good' refers to the evil inclination.'" The phenomenon of teshuva, repentance, could not exist without the creation of an evil inclination. Teshuva enables man to attain an even higher spiritual level and completeness than before he sinned; thus, G-d declared the creation "very good" only after Adam was created with this potential. (Sefer HaSichot 5749, Vol. 1)
By the sweat of your face shall you eat bread (Gen. 3:19)
Rabbi Yosef of Novhorodok used to say: If a person has to work night and day just to fulfill the curse of "By the sweat of your face shall you eat bread," how much more so should he expend time and effort to attain the blessing of "Blessed is the man who trusts in G-d!"
My sin is greater than I can bear (Gen. 4:13)
When a person sins and afterwards does teshuva, sincerely regretting his misdeed and returning to G-d with a whole heart, he refines and purifies the life-force he misused in committing the sin and elevates it to its higher spiritual source. When Cain declared, "My sin is greater than I can bear," he was saying that he felt incapable of elevating his terrible sin and transforming it into holiness. (Tzava'at HaRibash)