The traditional moralist, for example, will say that love should be unselfish. In a certain sense he is right, that is to say, it should not be selfish beyond a point, but it should undoubtedly be of such a nature that one's own happiness is bound up in its success. If a man were to invite a lady to marry him on the ground that he ardently desired her happiness and at the same time considered that she would afford him ideal opportunities of self-abnegation, I think it may be doubted whether she would be altogether pleased.
Source: The Conquest of Happiness (1930),p.246
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