Compound interest on debt was the banker's greatest invention, to capture, and enslave, a productive society.

If I had 20 days to solve a problem, I would take 19 days to define it

One does not make wars less likely by formulationg rules of warfare... war cannot be humanized. It can only be eliminated.

The longing to behold this pre-established harmony [of phenomena and theoretical principles] is the source of the inexhaustible patience and perseverance with which Planck has devoted himself ... The state of mind which enables a man to do work of this kind is akin to that of the religious worshiper or the lover; the daily effort comes from no deliberate intention or program, but straight from the heart.

Science has gone a long way toward helping man to free himself from the burden of hard labor; yet, science itself is not a liberator. It creates means, not goals. It is up to men to utilize those means to achieve reasonable goals.

One cannot deal with a problem with the same thinking that creates it.

I believe that pipe smoking contributes to a somewhat calm and objective judgement in all human affairs.