But let it be granted that Jesus observed all the Jewish usages, including even their sacrificial observances, what does that avail to prevent our recognising Him as the Son of God? Jesus, then, is the Son of God, who gave the law and the prophets; and we, who belong to the Church, do not transgress the law, but have escaped the mythologizings of the Jews, and have our minds chastened and educated by the mystical contemplation of the law and the prophets. For the prophets themselves, as not resting the sense of these words in the plain history which they relate, nor in the legal enactments taken according to the word and letter, express themselves somewhere, when about to relate histories, in words like this, “I will open my mouth in parables, I will utter hard sayings of old;” and in another place, when offering up a prayer regarding the law as being obscure, and needing divine help for its comprehension, they offer up this prayer, “Open my eyes, that I may behold wondrous things out of Your law.”
Source: Against Celsus (New Advent)