Those who flee temptation generally leave a forwarding address.

The quip plays on the language of postal forwarding to suggest that “fleeing” temptation is often more symbolic than real. Even when people try to avoid a vice, a risky relationship, or a habitual indulgence, they may keep a channel open—through rationalizations, nostalgia, or carefully preserved opportunities—to return to it. The humor sharpens a moral insight: temptation is not only external but also internal, carried by desire and memory. The line implies that genuine resistance requires more than changing circumstances; it requires changing intentions and habits, otherwise the temptation can always “find” you at your new address.