You will be more disappointed in life by the things that you do not do than by the things that you do.

You have power over your mind - not outside events. Realize this, and you will find strength.

There is nothing more real than what cannot be seen and there is nothing more certain than what cannot be heard.

There is an innocence in admiration: it occurs in one who has not yet realized that they might one day be admired.

The more we realize our minuteness and our impotence in the face of cosmic forces the more astonishing becomes what human beings have achieved.

In Christianity neither morality nor religion come into contact with reality at any point.