It stands to the everlasting credit of science that by acting on the human mind it has overcome man's insecurity before himself and before nature.

The more a man is imbued with the ordered regularity of all events the firmer becomes his conviction that there is no room left by the side of this ordered regularity for causes of a different nature. For him neither the rule of human nor the rule of divine will exist as an independent cause of natural events.

If one day you have to choose between the world and love, remember this: If you choose the world you’ll be left without love, but if you choose love, with it you will conquer the world

Nature conceals her mystery by her essential grandeur.

The genius is in making the complex simple.

When you are courting a nice girl an hour seems like a second. When you sit on a red-hot cinder a second seems like an hour. That's relativity.

Time and space are not conditions of existence, time and space is a model for thinking