The ideals which have always shone before me and filled me with the joy of living are goodness, beauty, and truth. To make a goal of comfort or happiness has never appealed to me; a system of ethics built on this basis would be sufficient only for a herd of cattle.

What use are socks? They only produce holes.

Common sense is nothing more than a deposit of prejudices laid down by the mind before you reach eighteen.

No amount of experimentation can ever prove me right; a single experiment can prove me wrong.

They come into being not through demonstration but through revelation, through the medium of powerful personalities.

The fanatical atheists are like slaves who are still feeling the weight of their chains which they have thrown off after hard struggle. They are creatures who—in their grudge against traditional religion as the "opium of the masses"—cannot hear the music of the spheres.

Anyone can repeat a technical explanation they read in a text-book or blog post.