"Some of us learned in a school of philosophy which taught that all was for the common good and nothing for oneself and have never, in any case, regarded the pursuit of happiness as anything other than an aberration of the human spirit."

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The Christian view that all intercourse outside marriage is immoral was, as we see in the above passages from St. Paul, based upon the view that all sexual intercourse, even within marriage, is regrettable. A view of this sort, which goes against biological facts, can only be regarded by sane people as a morbid aberration. The fact that it is embedded in Christian ethics has made Christianity throughout its whole history a force tending towards mental disorders and unwholesome views of life.

— Bertrand Russell