“Knowledge has to be improved, challenged, and increased constantly, or it vanishes.”– Peter Drucker Related Quotes “I’m not fascinated by one particular case, but by knowledge that I had no idea was out there.”– Shannon Miller “The doorstep to the temple of wisdom is a knowledge of our own ignorance.”– Benjamin Franklin “Every branch of human knowledge, if traced up to its source and final principles, vanishes into mystery.”– Arthur Machen