All that passes for knowledge can be arranged in a hierarchy of degrees of certainty, with arithmetic and the facts of perception at the top.

So far as I can remember, there is not one word in the Gospels in praise of intelligence.

Next to worry probably one of the most potent causes of unhappiness is envy.

The more we realize our minuteness and our impotence in the face of cosmic forces, the more amazing becomes what human beings have achieved.

Dogmatism and skepticism are both, in a sense, absolute philosophies; one is certain of knowing, the other of not knowing. What philosophy should dissipate is certainty, whether of knowledge or ignorance.

The mind is a strange machine which can combine the materials offered to it in the most astonishing ways.

To realize the unimportance of time is the gate to wisdom.