Philo Judaeus Legatio Ad Gaium 171

By these preposterous and accursed arguments he excited his own expectations, and trained himself, and inflamed his own wishes; and then he attended upon and courted Caius, day and night, never leaving him for a moment, but being with him at all times and on all occasions, and employing every moment when he was by himself, or when he was resting, to pour forth accusations against our nation, like a most infamous man as he was, exciting pleasure in the mind of the emperor by ridiculing the Jews and their laws and customs, that thus his calumnies might wound us the more effectually; for he never openly confessed himself to be our accuser, nor could he in fact make such a confession; but he went by all kinds of crooked paths, and practised every sort of manoeuvre, and thus was a more dangerous and formidable enemy than even those men who openly recorded their hatred of and hostility towards us.