The popular scientific books by our scientists aren't the outcome of hard work, but are written when they are resting on their laurels.

It would strike me as ridiculous to want to doubt the existence of Napoleon; but if someone doubted the existence of the earth 150years ago, perhaps I should be more willing to listen, for now he is doubting our whole system of evidence.

Words are probes. Some reach very deep, some only to a little depth.

There are, indeed, things that cannot be put into words. They make themselves manifest. They are what is mystical.

A confession has to be part of your new life.

When you are philosophizing you have to descend into primeval chaos and feel at home there.

Where two principles really do meet which cannot be reconciled with one another, then each man declares the other a fool and a heretic