Dear friend, all theory is gray,<br

Grau, theurer Freund, ist alle Theorie,<br
/>Und grün des Lebens goldner Baum.

Original text (German)

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Notes from Wikiquote

/>And green the golden tree of life. | Mephistopheles and the Student

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Quote text and notes from Wikiquote: Johann Wolfgang von Goethe (page history), available under CC BY-SA 4.0. Source quality and labels are our own summary of what Wikiquote records.