The best is the enemy of the good.
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By the same author and on kindred topics.
Voltaire, 1694–1778 -
Voltaire, 1694–1778 -
Work keeps at bay three great evils: boredom, vice and need.
Voltaire, 1694–1778 
The desire to appear clever often prevents one from becoming so.
François de La Rochefoucauld, 1613–1680 
The only safety for the vanquished is to hope for no safety.
Virgil, 70–19 BC 
They change their sky, not their soul, who rush across the sea.
Horace, 65–8 BC