The essence of a good marriage is respect for each other's personality combined with that deep intimacy, physical, mental, and spiritual, which makes a serious love between man and woman the most fructifying of all human experiences. Such love, like everything that is great and precious, demands its own morality, and frequently entails a sacrifice of the less to the greater; but such sacrifice must be voluntary, for, where it is not, it will destroy the very basis of the love for the sake of which it is made.
Source: Marriage and Morals, 1929, by Bertrand Russell
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https://russell-j.com/beginner/MM21-140.HTM
