p121 On the one hand, he(Celsus) offers logical and philosophical reasons why Christian beliefs cannot be accepted. Many of these arguments have a timeless character. The argument that God cannot do the impossible would fall into this category. On the other hand, he offers another line of criticism, linked to his view of Nomos, and peculiar to his own time and culture. He believed that truth and antiquity were one and that what was handed downiby the ancients was true because it was old.
p127 Porphyry was much more than a critic of Christianity. He was a philosopher in his own right trying to preserve the intellectual tradition of Greek antiquity and a religious thinker who sought to reconcile the religious heritage of the Greco-Roman world with philosophical reason.
p149 To the ancients, however, there were many different forms of divinity, and, as observed in the previous chapter, sophisticated thinkers such as Porphyry or Celsus believed that though there was one supreme God this did not prevent people from believing in other lesser gods. The term divine designated a category of being stretching from the one high God down through the Olympian gods, the visible gods (e.g., the stars), the daimones, and finally to heroes or deified men. The supreme God presided over a company of gods.
p153 To summarize Porphyry's argument: There is one God whom all men worship, and Jesus, like other pious men, worshipped this God and taught others to venerate him. By his teaching Jesus directed men's attention to the one God, but his disciples fell into error and taught men to worship Jesus.
p154 On the basis of Augustine's writings, Porphyry's discussion of Christianity in the Philosophy from Oracles included the following: (1) praise for Jesus as a good and pious man who ranks among the other sages or divine men, for example, Pythagoras or Heracles, venerated by the Greeks and Romans; (2) criticism of the disciples, and of those who follow their teaching, because they misrepresented Jesus and inaugurated a new form of worship; (3) defense of the worship of the one high God; (4) praise of the Jews for worshipping this one God.