Nothing is more sad than the death of an illusion.
Courage is never to let your actions be influenced by your fears.
One may not regard the world as a sort of metaphysical brothel for emotions.
The most persistent sound which reverberates through man's history is the beating of war drums.
The progress of science is strewn, like an ancient desert trail, with the bleached skeleton of discarded theories which once seemed to possess eternal life.