Nunc tuum Ferrum in Igni est.

Your iron is in the fire, work it now that it is soft, and you may give it what fashion you please; but if you suffer it to become cold, it will no longer yield to the hammer. Having begun the business, it must be diligently attended to or it will not succeed. Bisogna battere il ferro mentre è caldo, strike while the iron is hot; make hay while the sun shines.