Things should be made as simple as possible, but not any simpler.

Isn't it strange that I who have written only unpopular books should be such a popular fellow?

Time is what prevents everything from happening at once.

It was the experience of mystery - even if mixed with fear - that engendered religion.

One strength of the communist system of the East is that it has some of the character of a religion and inspires the emotions of a religion.

Never lose a holy curiosity.

In order to be an immaculate member of a flock of sheep, one must above all be a sheep oneself.

We still do not know one thousandth of one percent of what nature has revealed to us.

The unleashed power of the atom has changed everything save our modes of thinking and we thus drift toward unparalleled catastrophe.

Occurrences in this domain are beyond the reach of exact prediction because of the variety of factors in operation, not because of any lack of order in nature.

Politics is for the present, but an equation is for eternity.

The man of science is a poor philosopher.

<span class="cj-font-size-100">You cannot simultaneously prevent and prepare for war.</span>

The road to perdition has ever been accompanied by lip service to an ideal.

The process of scientific discovery is, in effect, a continual flight from wonder.

It gives me great pleasure indeed to see the stubbornness of an incorrigible nonconformist warmly acclaimed.

The faster you go, the shorter you are.

Pure mathematics is, in its way, the poetry of logical ideas.

The environment is everything that isn't me.

The important thing is not to stop questioning. Curiosity has its own reason for existing.