Cicero, On the Orator 2.155

[Scipio the younger, Laelius and Furius] said that the Athenians did something most welcome both to them and to many of the leading citizens, in that, when they sent envoys to the senate about their most important concerns [in 156/5 bc], they sent the three most distinguished philosophers of that age, Carneades and Critolaus and Diogenes [of Babylon]; and so these, while they were at Rome, were frequently listened to both by themselves and by others.

Cicero, On Ends 5.14

Critolaus wished to imitate the early [Peripatetics], and indeed he is closest [to them] in seriousness, and his style is free-flowing; but not even he holds to the principles of his ancestors. Diodorus, his pupil, adds to moral virtue [honestas] freedom from pain. He too has a position of his own; and since he disagrees about the supreme good he cannot truly be called a Peripatetic. It seems to me that our Antiochus follows the opinion of the ancients most carefully; he teaches that it was the same for Aristotle and for Polemo.