Look thou be true; do not give dalliance
Too much the rein. The strongest oaths are straw
To the fire i’ the blood. Be more abstemious.

– William Shakespeare

The Tempest, Act 4, Scene 1. Prospero warns Ferdinand to be true to Miranda after marriage. He tells him in metaphorical language not to be over-flirtatious as the strongest marriage rows can burn like straw in the fire of passion. Instead he should practice moderation.