Strike while the iron is hot

Origin

In the world of the blacksmith, shaping metal requires perfect timing and immense heat. Iron must be heated in a forge until it glows red, becoming soft and pliable enough to be molded by the hammer. If the blacksmith delays, the iron quickly cools and hardens, rendering it resistant to shaping until reheated. This tangible lesson—the urgent necessity of swinging the hammer and "striking" the metal precisely when it is at its most malleable—became a potent metaphor. The imperative to act decisively at the peak of an opportunity, before it fades and is lost, thus hammered its way into the lexicon as enduring wisdom for seizing the moment.