“The Great Commandment demands of everyone the total love of God and the love one's neighbour according to the measure of man's natural self-affirmation. If love is emotion, how can it be demanded? Emotions cannot be demanded. We cannot demand them of ourselves. If we try, something artificial is produced which shows the traits of what had to be suppressed in its production. Repentance, intentionally produced, hides self-complacency in perversion. Love, intentionally produced, shows indifference or hostility in perversion. The means: love as an emotion cannot be commanded. Either love is something other than emotion or the Great Commandment is meaningless.”
Source: Love, Power and Justice (1954), p. 4
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Paul Tillich 61
German-American theologian and philosopher 1886–1965Related quotes

Source: (1776), Book I, Chapter VI, p. 60.

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Context: The gods we stand by are the gods we need and can use, the gods whose demands on us are reinforcements of our demands on ourselves and on one another. What I then propose to do is, briefly stated, to test saintliness by common sense, to use human standards to help us decide how far the religious life commends itself as an ideal kind of human activity. … It is but the elimination of the humanly unfit, and the survival of the humanly fittest, applied to religious beliefs; and if we look at history candidly and without prejudice, we have to admit that no religion has ever in the long run established or proved itself in any other way. Religions have approved themselves; they have ministered to sundry vital needs which they found reigning. When they violated other needs too strongly, or when other faiths came which served the same needs better, the first religions were supplanted.

“The Social Security Myth” https://www.youtube.com/watch?v=rCdgv7n9xCY&t=124s (1980s)