As far as the laws of mathematics refer to reality, they are not certain, and as far as they are certain, they do not refer to reality.

Science is a wonderful thing if one does not have to earn one's living at it.

I believe that we don't need to worry about what happens after this life, as long as we do our duty here-to love and to serve.

The whole of science is nothing more than a refinement of everyday thinking.

Where there is love, there is no imposition.

A single bomb of this type, carried by boat and exploded in a port, might very well destroy the whole port, together with some of the surrounding territory.

The religious geniuses of all ages have been distinguished by this kind of religious feeling, which knows no dogma and no God conceived in man's image; so that there can be no church whose central teachings are based on it. Hence it is precisely among the heretics of every age that we find men who were filled with this highest kind of religious feeling and were in many cases regarded by their contemporaries as atheists, sometimes also as saints. Looked at in this light, men like Democritus, Francis of Assisi, and Spinoza are closely akin to one another.