Any foolish boy can stamp on a beetle, but all the professors in the world cannot make a beetle.

The intellectual attainments of a man who thinks for himself resemble a fine painting, where the light and shade are correct, the tone sustained, the colour perfectly hamonized; it is true to life.

It is not what things are objectively and in themselves, but what they are for us, in our way of looking at them, that makes us happy or the reverse.

Will power is to the mind like a strong blind man who carries on his shoulders a lame man who can see.

This world could not have been the work of an all-loving being, but that of a devil, who had brought creatures into existence in order to delight in the sight of their sufferings.

Every original idea is first ridiculed, then vigorously attacked, and finally taken for granted.

It is only the hope of what is claimed that begets and nurishes the wish.