Politics is more difficult than physics.

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

Conviction is a good motive, but a bad judge.

So long as there are men, there will be wars.

It is harder to crack prejudice than an atom.

There are yet people who say there is no God. But what really makes me angry is that they quote me for the support of such views

Example isn't another way to teach, it is the only way to teach.