Fools are stubborn in their way,
As coins are hardened by the allay;
And obstinacy's never so stiff
As when 'tis in a wrong belief. [ Butler ]

Authors, like coins, grow dear as they grow old. [ Pope ]

To express the most difficult matters clearly, and everything intelligibly, is to strike coins out of pure gold. [ Geibel ]

A poet of superior merit, whose vein is of no vulgar kind, who never winds off anything trite, nor coins a trivial poem at the public mint, I cannot describe, but only recognise as a man whose soul is free from all anxiety. [ Juv ]