 Diodorus was also closely associated with the ‘Veiled’ paradox (Diogenes Laertius, 2.111; Lucian, Sale of lives, 22–3): you know who your father is; you don’t know who the veiled man over there is; but that veiled man is your father; so you both do and do not know who your father is. We might conjecture Diodorus’ own solution to have been once again a semantic one. At each of its occurrences ‘know’ has, in the respondent’s mind, a distinct meaning appropriate to the case (acquaintance, recognition), and hence no contradiction is involved.