Avoiding Haughtiness:

Rav Hersh of Rimanov zy"a (Sefer Be'eros Mayim) says that with his great intelligence, Korach devised a plan to gather a crowd against Moshe Rabenu. In addition to smart, he had sterling yichus and he was very wealthy. And this all led to his downfall.

This is a lesson to avoid haughtiness. One should not be proud of his intellect, his yichus or his wealth. Instead, he should constantly daven to Hashem and ask Him to protect him from the yeitzer hara.