“If the fool would persist in his folly he would become wise.”
Source: 1790s, The Marriage of Heaven and Hell (1790–1793), Proverbs of Hell, Line 18
Source: The Complete Poetry and Prose
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William Blake 249
English Romantic poet and artist 1757–1827Related quotes

“Love is the wisdom of the fool and the folly of the wise.”

Life of Marcus Cato
Bartlett's Familiar Quotations, 10th ed. (1919)

Mysterium Coniunctionis http://books.google.com/books?id=fqt-AAAAMAAJ&q=%22The+wise+man+who+is+not+heeded+is+counted+a+fool+and+the+fool+who+proclaims+the+general+folly+first+and+loudest+passes+for+a+prophet+and%22+%22and+sometimes+it+is+luckily+the+other+way+round+as+well+or+else+mankind+would+long+since+have+perished+of+stupidity%22&pg=PA549#v=onepage (1955)

“If any man among you seemeth to be wise in this world, let him become a fool, that he may be wise.”
1 Corinthians 3:18 (KJV)
First Epistle to the Corinthians

“The fool doth think he is wise, but the wise man knows himself to be a fool.”
Touchstone, Act V, scene i
Source: As You Like It (1599–1600)

“The fool doth think he is wise, but the wise man knows himself to be a fool.”
Touchstone, Act V, scene i
Misattributed