Max Horkheimer

When even the dictators of today appeal to reason, they mean that they possess the most tanks. They were rational enough to build them; others should be rational enough to yield to them.

A revolutionary career does not lead to banquets and honorary titles, interesting research and professorial wages. It leads to misery, disgrace, ingratitude, prison and a voyage into the unknown, illuminated by only an almost superhuman belief.

The complexity of the connection between the world of perception and the world of physics does not preclude that such a connection can be shown to exist at any time.