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  4. Pedro Calderon de la Barca
  5. No virtue can be real that has not been tried. The gold in...

No virtue can be real that has not been tried. The gold in the crucible alone is perfect; the loadstone tests the steel, and the diamond is tried by the diamond, while metals gleam the brighter in the furnace.

Pedro Calderon de la Barca
Real, Perfect, Crucible
No virtue can be real that has not been tried. The gold in the crucible alone is perfect; the loadstone tests the steel, and the diamond is tried by the diamond, while metals gleam the brighter in the furnace.