Parashas Eikev · Passuk 8:14
beware lestclest Heb. pen; moved down from v. 12 for clarity. your heart grow haughty and you forget the ETERNAL your God—who freed you from the land of Egypt, the house of bondage;
Torah Temimah points to Sotah 4b.
TT lemma: ורם לבבך ושכחת (unit 2 of 3).
English: R’ Yochanan said: Anyone who has arrogance of spirit is as if he denied the fundamental principle, as it is said, “and your heart grows haughty and you forget Hashem.”
Custom (arrogance as denial of the fundamental)
Ga’avah is not a small character flaw; it is classed with kefirah because it opens the door to forgetting God.