Also attributed on quote sites without a source, and can be found in some recent non-academic books but also without a source, and google books shows no examples of the quote in any 20th century book. Earliest example found is a usenet post from 11 April 1990.
More quotes by Plato
Oh dear Pan and all the other Gods of this place, grant that I may be beautiful inside.
Wonder is the feeling of a philosopher, and philosophy begins in wonder.
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If the doors of perception were cleansed, everything would appear to man as it is: infinite.
The land of easy mathematics where he who works adds up and he who retires subtracts.
Attribution
Quote text and notes from Wikiquote: Plato (page history), available under CC BY-SA 4.0. Source quality and labels are our own summary of what Wikiquote records.