The goldsmith never leaves his crucible once it has entered the fire. He periodically lifts out the gold, lets it cool, rubs it between his fingers, and if not satisfied puts it back … This time he blows the fire hotter than it was before, and each time he puts the gold back into the crucible, the heat of the fire is increased, “It could not bear it so hot at first, but it can bear it now; what would have destroyed it then helps it now.” “How do you know when the gold is purified?” we asked, and he answered, “When I can see my face in it, then it is pure.”

– Amy Carmichael –
from Gold Cord