In Diogenes Laertius, Lives and Opinions of Eminent Philosophers, bk. 4, sec. 60
Ὀψὲ δὲ αὐτῷ γεωμετροῦντι λέγει τις, "εἶτα νῦν καιρός;" "εἶτα μηδὲ νῦν."
Original text (Ancient Greek)
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Translated by C. D. Yonge (1853) | He studied geometry late, and some one said to him, "Is this a proper time?" To which he replied, "Nay, is it not even yet the proper time?" | Translated by R. D. Hicks (1925) | If I should not be learning now, when should I be? | Paraphrased in Burton Stevenson, The Home Book of Quotations (1934), p. 1098