Shun idleness is the rust that attaches itself to the most brilliant metals.
— Voltaire

I weigh the man, not his title; 'tis not the king's stamp can make the metal better.
William Wycherley metallic quote

Constancy... that small change of love, which people exact so rigidly, receive in such counterfeit coin, and repay in baser metal.
— Lord Byron

Why not a space flower? Why do we always expect metal ships?
— W. D. Richter

An excellent man, like precious metal, is in every way invariable; A villain, like the beams of a balance, is always varying, upwards and downwards.
— metallic quotation by John Locke