Creative activity could be described as a type of learning process where teacher and pupil are located in the same individual.

Nothing is more sad than the death of an illusion.

Nothing is more sad than the death of an illusion.

The most persistent sound which reverberates through man's history is the beating of war drums.

Courage is never to let your actions be influenced by your fears.

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.