There is a a verifiable source: Rush Rhees (ed), Recollections of Wittgenstein (OUP, 1984) p. 125
More quotes by Ludwig Wittgenstein
Don't for heaven's sake, be afraid of talking nonsense! But you must pay attention to your nonsense.
The way you use the word "God" does not show whom you mean — but, rather, what you mean.
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Love looks not with the eyes, but with the mind,
And therefore is wing'd Cupid painted blind.
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Love seldom haunts the breast where learning lies,
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Attribution
Quote text and notes from Wikiquote: Ludwig Wittgenstein (page history), available under CC BY-SA 4.0. Source quality and labels are our own summary of what Wikiquote records.