In re mathematica ars proponendi quaestionem pluris facienda est quam solvendi.
Doctoral thesis (De aequationibus secundi gradus indeterminatis, 1867); variant translation: In mathematics the art of proposing a question must be held of higher value than solving it.
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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: Georg Cantor (page history), available under CC BY-SA 4.0. Source quality and labels are our own summary of what Wikiquote records.