“In the latter formulations, e.g., with regard to adultery, Jesus was crystal clear about sins of the inner self, the core being, or “cardia,” for the human heart.”
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I always took this to mean a man who becomes obsessed with a woman he knows is married to another and fantasizes about her. I have heard it presented as meaning any man who sees an attractive woman and experiences desire, I don’t buy that one, such a reaction is an involuntary thing.
I’ve read somewhere an analogy between temptation/giving in to temptation and brushing a live ember off your sleeve immediately as opposed to letting it sit there and burn a hole in your jacket.