Firmness of purpose is one of the most necessary sinews of character, and one of the best instruments of success. Without it genius wastes its efforts in a maze of inconsistencies.
Lord Chesterfield (1694-1773) British statesman.
It is only persons of firmness that can have real gentleness. Those who appear gentle are, in general, only a weak character, which easily changes into asperity.
François de La Rochefoucauld (1613-1680) French writer.
The greatest firmness is the greatest mercy.
Henry Wadsworth Longfellow (1807-1882) U.S. poet.