On wisdom.

"Wisdom is the rarest quality of all - the ability to combine intellect, knowledge, experience, and judgment in a way to produce a coherent understanding. Wisdom is the fulfillment of the ancient admonition, 'With all your getting, get understanding.' Wisdom requires self-discipline and an understanding of the realities of the world, including the limitations of one's own experience and of reason itself. The opposite of high intellect is dullness or slowness, but the opposite of wisdom is foolishness, which is far more dangerous."

- Thomas Sowell, 'Intellectuals and Society'