Common sense consists of those layers of prejudice laid down before the age of 18.

The indifference, callousness and contempt that so many people exhibit toward animals is evil first because it results in great suffering in animals, and second because it results in an incalculably great impoverishment of the human spirit.

I am convinced there is only one way to eliminate these grave evils, namely through the establishment of a socialist economy, accompanied by an educational system which would be oriented toward social goals.

A little knowledge is a dangerous thing. So is a lot.

In scientific thinking are always present elements of poetry. Science and music requires a thought homogeneous.

The monotony and solitude of a quiet life stimulates the creative mind.

I do not believe that a man should be restrained in his daily actions by being afraid of punishment after death or that he should do things only because in this way he will be rewarded after he dies. This does not make sense. The proper guidance during the life of a man should be the weight that he puts upon ethics and the amount of consideration that he has for others.