It is obviously possible that what we call waking life may only be an unusual and persistent nightmare.

How about Pithecanthropus Erectus? Was it really he who ate the apple? Or was it Homo Pekiniensis?

Machines deprive us of two things which are certainly important ingredients of human happiness, namely, spontaneity and variety.

The human heart as modern civilization has made it is more prone to hatred than to friendship. And it is prone to hatred because it is dissatisfied.

The secrets to happiness include enterprise, exploration of one's interests and the overcoming of obstacles.

The knowledge exists by which universal happiness can be secured; the chief obstacle to its utilization for that purpose is the teaching of religion. Religion prevents our children from having a rational education; religion prevents us from removing the fundamental causes of war; religion prevents us from teaching the ethic of scientific cooperation in place of the old fierce doctrines of sin and punishment. It is possible that mankind is on the threshold of a golden age; but, if so, it will be necessary first to slay the dragon that guards the door, and this dragon is religion.

Only mathematics and mathematical logic can say as little as the physicist means to say.