Nam Graeci quidem sic te ita viventem intuebuntur, ut quemdam ex annalium memoria, aut etiam de caelo divinum hominem esse in provinciam delapsum putent.
Credo marks the statement as ironical.
For indeed the Greeks will look at you, living as you do in that way, as to think you are someone out of the history of their annals, or even think that you are a godlike man from heaven having snuck into the province. Omnes etiam, qui istinc veniunt, ita de tua virtute, integritate, humanitate commemorant, ut in tuis summis laudibus excipiant unam iracundiam. And yet all who come from there, although they mention your virtue, integrity, your compassion, nevertheless they make an exception of one thing in your highest praises, that is your quick temper. That flaw not only seems to be of a fickle and feeble mind, in this private and daily life, but also truly nothing is so unbecoming, than to indeed apply a bitterness of your nature to your supreme command. Ac iam hoc loco non hortatione neque praeceptis, sed precibus tecum fraternis ago, totum ut animum, curam, cogitationemque tuam ponas in omnium laude undique colligenda.