We never know, believe me, when we have succeeded best.

The truth is that my work - I was going to say my mission - is to shatter the faith of men here, there, and everywhere, faith in affirmation, faith in negation, and faith in abstention in faith, and this for the sake of faith in faith itself; it is to war against all those who submit, whether it be to Catholicism, or to rationalism, or to agnosticism; it is to make all men live the life of inquietude and passionate desire.

May God deny you peace but give you glory!

Science teaches us, in effect, to submit our reason to the truth and to know and judge of things as they are-that is to say, as they themselves choose to be and not as we would have them to be.

Science is the most intimate school of resignation and humility, for it teaches us to bow before the seemingly most insignificant of facts.

These terrible sociologists, who are the astrologers and alchemists of our twentieth century.

All knowledge has an ultimate goal. Knowledge for the sake of knowledge is, say what you will, nothing but a dismal begging of the question.