We have no right to assume that any physical laws exist, or if they have existed up until now, that they will continue to exist in a similar manner in the future.

There is a real world independent of our senses; the laws of nature were not invented by man, but forced on him by the natural world. They are the expression of a natural world order.

Ego is the immediate dictate of human consciousness.

A new scientific truth is usually not propagated in such a way that opponents become convinced and discard their previous views. No, the adversaries eventually die off, and the upcoming generation is familiarised anew with the truth.

A scientist is happy, not in resting on his attainments but in the steady acquisition of fresh knowledge.

No burden is so heavy for a man to bear as a succession of happy days.

It is not the possession of truth, but the success which attends the seeking after it, that enriches the seeker and brings happiness to him.