A man should look for what is, and not for what he thinks should be.

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Man is here for the sake of other men – above all for those upon whose smiles and well-being our own happiness depends.

It is a miracle that curiosity survives formal education.

More careful reflection teaches us, however, that the special theory of relativity does not compel us to deny ether...To deny the ether is ultimately to assume that empty space has no physical qualities whatever.

He suffered incessantly from the fact that his critical faculties transcended his constructive capacities. In a manner of speaking, his critical sense robbed him of his love for the offspring of his own mind even before they were born.

I am thankful to all who said no to me. It is because of them that I'm doing it myself.

I am not a genius, I am just curious. I ask many questions. and when the answer is simple, then God is answering.

In the middle of difficulty lies opportunity.

If tomorrow were never to come, it would not be worth living today.

A person starts to live when he can live outside himself.

Peace cannot be kept by force; it can only be achieved by understanding.

Relativity applies to physics not ethics.

In every true searcher of Nature there is a kind of religious reverence, for he finds it impossible to imagine that he is the first to have thought out the exceedingly delicate threads that connect his perceptions.

No one does anything right in life, until they realize that they are making a mistake.

I cannot imagine a God who rewards and punishes the objects of his creation, whose purposes are modeled after our own -- a God, in short, who is but a reflection of human frailty. Neither can I believe that the individual survives the death of his body, although feeble souls harbor such thoughts through fear or ridiculous egotisms.