When you sit with a nice girl for two hours, it seems like two minutes; when you sit on a hot stove for two minutes, it seems like two hours. That's relativity.

Great spirits have always found violent opposition from mediocre minds. The latter cannot understand it when a man does not thoughtlessly submit to hereditary prejudices but honestly and courageously uses his intelligence.

Epistemology without contact with science becomes an empty scheme. Science without epistemology is-insofar as it is thinkable at all-primitive and muddled.

Common sense consists of those layers of prejudice laid down before the age of 18.

Education is only a ladder to gather fruit from the tree of knowledge, not the fruit itself

Do you really believe that the moon isn’t there when nobody looks?

Those who manage their way into a crisis are not necessarily the right people to manage their way out of a crisis