Assuming that he believes at all, the everyday Christian is a pitiful figure, a man who really cannot count up to three, and who besides, precisely because of his mental incompetence, would not deserve such a punishment as Christianity promises him.

If married couples did not live together, happy marriages would be more frequent.

Time, space, and causality are only metaphors of knowledge, with which we explain things to ourselves.

It is hard enough to remember my opinions, without also remembering my reasons for them!

The lack of closeness among friends is a fault that cannot be reprimanded without becoming incurable.

Science ... has no consideration for ultimate purposes, any more than Nature has, but just as the latter occasionally achieves things of the greatest suitableness without intending to do so, so also true science, as the imitator of nature in ideas, will occasionally and in many ways further the usefulness and welfare of man,-but also without intending to do so.

One repays a teacher badly if one always remains nothing but a pupil.