Full Idea
Intellectualism, a one-sided preoccupation with reason and reasoning, is a perennial failing in moral philosophy.
Gist of Idea
Intellectualism is an excessive emphasis on reasoning in moral philosophy
Source
Myles F. Burnyeat (Aristotle on Learning to be Good [1980], p.70)
Book Reference
'Essays on Aristotle's Ethics', ed/tr. Rorty,Amélie Oksenberg [University of California 1980], p.70
A Reaction
But Kant's reply would be that while there is much more to moral behaviour, the only part which matters in morality is the reasoning part. And Socrates' view (ignorance is evil) is not obviously wrong.