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

One must console oneself with the thought that time has a sieve through which most of these important things run into the ocean of oblivion and what remains after this selection is often still trite and bad.

As to science, we may well define it for our purpose as "methodical thinking directed toward finding regulative connections between our sensual experiences".

I believe that whatever we do or live for has its causality; it is good, however, that we cannot see through to it.

I find it difficult to believe that I belong to such an idiotic, rotten species - the species that actually boasts of its freedom of will, heroism on command, senseless violence, and all of the loathsome nonsense that goes by the name of patriotism.

Although words exist for the most part for the transmission of ideas, there are some which produce such violent disturbance in our feelings that the role they play in the transmission of ideas is lost in the background.

Everything is energy and that’s all there is to it.