Lk. brings in here the law of reciprocity (Matthew 7:12), hardly in its proper place, as the change from singular to plural shows, but in sympathy with what goes before, though not quite in line, and therefore inserted at this point as the best place to be found for the golden rule. It seems to be meant as a general heading for the particular hypothetical cases following = you would like men to love you, therefore love them whether they love you or not, etc.

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Old Testament