Most striking at first is the appearance of sudden illumination, a manifest sign of long unconscious prior work.

But all of my efforts served only to make me better acquainted with the difficulty, which in itself was something.

Thought is only a flash between two long nights, but this flash is everything.

Sociology is the science with the greatest number of methods and the least results.

All the scientist creates in a fact is the language in which he enunciates it. If he predicts a fact, he will employ this language, and for all those who can speak and understand it, his prediction is free from ambiguity. Moreover, this prediction once made, it evidently does not depend upon him whether it is fulfilled or not.

It is through science that we prove, but through intuition that we discover.

Science is built up with facts, as a house is with stones. But a collection of facts is no more a science than a heap of stones is a house.