We do not take humor seriously enough.
Barking dogs occasionally bite, but laughing men hardly ever shoot.
The bond with a true dog is as lasting as the ties of this earth will ever be.
I have found the missing link between the higher ape and civilized man; it is we.
Evil, by definition, is that which endangers the good, and the good is what we perceive as a value.
I believe that present day civilized man suffers from insufficient discharge of his aggressive drive.
Truth in science can be defined as the working hypothesis best suited to open the way to the next better one.
It is a good morning exercise for a research scientist to discard a pet hypothesis every day before breakfast. It keeps him young.
We had better dispense with the personification of evil, because it leads, all too easily, to the most dangerous kind of war: religious war.
Most of the vices and mortal sins condemned today correspond to inclinations that were purely adaptive or at least harmless in primitive man.