One should never impose one's views on a problem; one should rather study it, and in time a solution will reveal itself.

The only thing more dangerous than ignorance is arrogance

Every kind of peaceful cooperation among men is primarily based on mutual trust and only secondarily on institutions such as courts of justice and police.

The contemplation of this world beckoned as a liberation (...)The road to this paradise was not as comfortable and alluring as the road to the religious paradise; but it has shown itself reliable, and I have never regretted having chosen it.

Physics is an attempt conceptually to grasp reality as something that is considered to be independent of its being observed. In this sense one speaks of physical reality.

People are like bicycles. They can keep their balance only as long as they keep moving.

Make everything as simple as possible, but not simpler.