I once thought that if I could ask God one question, I would ask how the universe began, because once I knew that, all the rest is simply equations. But as I got older I became less concerned with how the universe began. Rather, I would want to know why he started the universe. For once I knew that answer, then I would know the purpose of my own life.

It has often been said, and certainly not without justification, that the man of science is a poor philosopher.

Compound interest is the eighth wonder of the world. He who understands it, earns it ... he who doesn't ... pays it.

However we select from nature a complex [of phenomena] using the criterion of simplicity, in no case will its theoretical treatment turn out to be forever appropriate (sufficient).... I do not doubt that the day will come when [general relativity], too, will have to yield to another one, for reasons which at present we do not yet surmise. I believe that this process of deepening theory has no limits.

Imagination Is More Powerful Than Knowledge Because Knowledhe Is Limited But Imagination Is Without Boundaries

Convictions can best be supported with experience and clear thinking.

Well-being and happiness never appeared to me as an absolute aim. I am even inclined to compare such moral aims to the ambitions of a pig.