Very common online pop-psychological slogan which has been traced no further than a graduation speech to students at San Francisco University High School given by Bill Bullard, who within the speech attributes it to George Eliot. For the Faculty. The atttribution to Eliot seems likewise to be false.
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.
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.