Fast day. Selichot (p. 356). Avinu Malkeinu (p. 277).
Friday Tevet 10 5703
Chumash: Vayigash, Shishi with Rashi.
Tehillim: 55-59.
Tanya: Yet the vitality (p. 29)...of flesh and blood (p. 31).
From the Tzemach Tzedek's answer at Yechidus: It is written, "Let the wicked leave his path and the man of sin his thoughts etc." [1]
Aven (sin) is the same as On, [2] meaning power and strength.
Just as it is imperative that the "wicked leave his path," for without Teshuva it is impossible to approach the Sacred, [3] so must the "man of strength," one with unshakeable confidence in his reasoning, "leave his thoughts."
He is not to insist, "I say so. This is what I think;" every "I", ego, is a source of evil, a cause of divisiveness.
Notes:
Yeshayahu 55:7.
In Hebrew spelling, but using a different vowel.
See Tanya Ch. 17.