Answer: Some intelligent people find it difficult to make decisions by ascending above their reason, whereas others are intelligent and able to understand that their wisdom is not worth a thing. That is why it is easy for them to renounce it.
It all depends on how a person uses his wisdom. Intelligence is not a flaw. Every quality depends on how a person uses it: usefully or not.
From the 1st part of the Daily Kabbalah Lesson 10/25/10, “Show Me Your Honor”