I find the selectivity of erotic love - the choice of this man or this woman - much more intelligible if liking the person is the origin of sexual interest, rather than the other way.

In the case of good books, the point is not to see how many of them you can get through, but how many can get through to you.

Not to engage in this pursuit of ideas is to live like ants instead of like men.

There are genuine mysteries in the world that mark the limits of human knowing and thinking. Wisdom is fortified, not destroyed, by understanding its limitations. Ignorance does not make a fool as surely as self-deception.

Philosophy is everybody's business.

The teacher's role in discussion is to keep it going along fruitful lines - be moderating, guiding, correcting and arguing like one more students.

Friendship is a very taxing and arduous form of leisure activity.