Refiner's Fire - Brian Doerksen Purify my heart, let me be as gold and precious silver; Purify my heart, let me be as gold, pure gold. Chorus Refiner's fire, my heart's one desire Is to be holy set apart for You, Lord. I choose to be holy, set apart for You, my Master, Ready to do Your will. Last Time: Ready to do Your will. Purify my heart, cleanse my from with in and make me holy; Purify my heart, cleanse my from my sin deep within.