All intelligent thoughts have already been thought;
what is necessary is only to try to think them again.
Alles Gescheite ist schon gedacht worden.
Man muss nur versuchen, es noch einmal zu denken.
Man muss nur versuchen, es noch einmal zu denken.
Original text (German)
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Variants
All truly wise thoughts have been thoughts already thousands of times; but to make them truly ours, we must think them over again honestly, till they take root in our personal experience.