Man…who lives in three places – in the past, in the present, and in the future – can be unhappy if one of these three is worthless. Religion has even added a fourth – eternity.

Of all the inventions of man I doubt whether any was more easily accomplished than that of a Heaven.

Perhaps in time the so-called Dark Ages will be thought of as including our own.

First there is a time when we believe everything, then for a little while we believe with discrimination, then we believe nothing whatever, and then we believe everything again - and, moreover, give reasons why we believe.

What we have to discover for ourselves leaves behind in our mind a pathway that can be used on another occasion.

The pleasures of the imagination are as it were only drawings and models which are played with by poor people who cannot afford the real thing.

To do the opposite of something is also a form of imitation, namely an imitation of its opposite.