As to the gods, I have no means of knowing either that they exist or that they do not exist. For many are the obstacles that impede knowledge, both the obscurity of the question and the shortness of human life.

Περὶ μὲν θεῶν οὐκ ἔχω εἰδέναι οὔθ᾽ ὡς εἰσίν, οὔθ᾽ ὡς οὐκ εἰσίν· πολλὰ γὰρ τὰ κωλύοντα εἰδέναι, ἥ τ᾿ ἀδηλότης καὶ βραχὺς ὢν ὁ βίος τοῦ ἀνθρώπου.

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Quoted in Diogenes Laërtius, Lives of Eminent Philosophers, b. 9, sec. 51. Translated by R. D. Hicks, vol. 2 (1925) p. 465. Diogenes adds: "For this introduction to his book the Athenians expelled him; and they burnt his works in the market-place, after sending round a herald to collect them from all who had copies in their possession."

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