Sextus Empiricus Pyrrhoniae Hypotyposes 1.33.234

[234] And if one ought to credit also what is said about him, he appeared at the first glance, they say, to be a 'Pyrrhonean, but in reality he was a dogmatist; and because he used to test his companions by means of dubitation to see if they were fitted by nature for the reception of the Platonic dogmas, he was thought to be a dubitative philosopher, but he actually passed on to such of his companions as were naturally gifted the dogmas of Plato. And this was why Ariston ¹ described him as ‟Plato the head of him, Pyrrho the tail, in the midst Diodorus;” ² because he employed the dialectic of Diodorus, although he was actually a Platonist.