Maybe this way because intellectuals have a tendency to become self-obsessed with the products of their mind. Mental masturbation. Perhaps present in the divide in particle physics, the strong pet theories of quantum gravity and string theory with little attempt to connect to the two. Of course, not every intellectual minded person fits into this extreme.

It is a matter of balance, you may find the arrogant intellectual has a vastly overdeveloped intellect and a skilled debater but with an underdeveloped character or sense of self.

When I first met someone whom I could say definitively had 'wisdom' , they were far from what you might call 'intellectual'. And the most wise people I have ever met have not at all been intellectual. At the same time, I've met intellectuals who had a great deal of wisdom. But there is not a straight-line between intelligent and wise. There is a great difference between knowing something, and understanding something. It can really be opposite of that of intellect, a process of unlearning rather than learning.