"We are told such a number as the square root of 2 worried Pythagoras and his school almost to exhaustion. Being used to such queer numbers from early childhood, we must be careful not to form a low id…"

"We are part of the world, and the world is part of us."

"A theoretical science, if it is to be healthy, must be able to hold its own against the practical application of its theories."

"The true path to knowledge is to question everything."

"If we were to pursue the idea to its logical conclusion, we would have to assume that every thought, every feeling, every sensation is somehow connected with an elementary process in the brain, with a…"