It is the worst of madness to learn what has to be unlearnt.
Extremæ est dementiæ discere dediscenda.
Original text (Latin)
More quotes by Erasmus
Do not be guilty of possessing a library of learned books while lacking learning yourself.
I am a citizen of the world, known to all and to all a stranger.
A speech comes alive only if it rises from the heart, not if it floats on the lips.
The most disadvantageous peace is better than the most just war.
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Reading maketh a full man; conference a ready man; and writing an exact man.
Without education, we are in a horrible and deadly danger of taking educated people seriously.
Learning will be cast into the mire and trodden down under the hoofs of a swinish multitude.
Attribution
Quote text and notes from Wikiquote: Erasmus (page history), available under CC BY-SA 4.0. Source quality and labels are our own summary of what Wikiquote records.