  The evidence favours the latter reading. There are a significant number of other passages where something very like Theaetetus’ claim (D3) that knowledge is “true belief with an account” is not only discussed, but actually defended: for instance, Meno 98a2, Phaedo 76b5–6, Phaedo 97d–99d2, Symposium 202a5–9, Republic 534b3–7, and Timaeus 51e5. So it appears that, in the Theaetetus, Plato cannot be genuinely puzzled about what knowledge can be. Nor can he genuinely doubt his own former confidence in one version of D3. If he does have a genuine doubt or puzzle of this sort, it is simply incredible that he should say what he does say in 201–210 without also expressing it.