Learn to be as analytical about things of which you are credulous as you are of those which you criticise.

The laziness of adolescence is a rehearsal for the incapacity of old age.

The Sufi is One who does not care when something is taken from him, but who does not cease to seek for what he has not.

You need not wonder whether you should have an unreliable person as a friend. An unreliable person is nobody's friend.

Sometimes a pessimist is only an optimist with extra information.

It is not only a matter of not caring who knows - it is also a matter of knowing who cares.

People today are in danger of drowning in information; but, because they have been taught that information is useful, they are more willing to drown than they need be. If they could handle information, they would not have to drown at all.