Because love is blind and the truth can see...

It seems to have been adapted from the phrase
'to play for love (of the game)' (that is, to play for nothing).
Although the theory is often heard that it represents the French word l'oeuf an 'egg'
(from the resembance between an egg and a nought) this seems unlikely.
But the cricketer's 'duck' is another matter.
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