Now his principal doctrines were these. That atoms and the vacuum were the beginning of the universe; and that everything else existed only in opinion. (trans. Yonge 1853)
δοκεῖ δὲ αὐτῶι τάδε· ἀρχὰς εἶναι τῶν ὅλων ἀτόμους καὶ κενόν, τὰ δ'ἀλλα πάντα νενομίσθαι [δοξάζεσθαι]. (Diogenes Laërtius, Democritus, Vol. IX, 44)
Original text (Ancient Greek)
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Notes from Wikiquote
Often paraphrased as "Nothing exists except atoms and empty space; everything else is opinion."