Celsus, however, accepting or granting that Jesus foreknew what would befall Him, might think to make light of the admission, as he did in the case of the miracles, when he alleged that they were wrought by means of sorcery; for he might say that many persons by means of divination, either by auspices, or auguries, or sacrifices, or nativities, have come to the knowledge of what was to happen. But this concession he would not make, as being too great a one; and although he somehow granted that Jesus worked miracles, he thought to weaken the force of this by the charge of sorcery. Now Phlegon, in the thirteenth or fourteenth book, I think, of his Chronicles, not only ascribed to Jesus a knowledge of future events (although falling into confusion about some things which refer to Peter, as if they referred to Jesus), but also testified that the result corresponded to His predictions. So that he also, by these very admissions regarding foreknowledge, as if against his will, expressed his opinion that the doctrines taught by the fathers of our system were not devoid of divine power.
Source: Against Celsus (New Advent)