18 He raises the objection that when God gave his second blessing, permission was granted to eat flesh, which had not in the first benediction been allowed. He should know that just as divorce according to the Saviour's word was not permitted from the beginning, but on account of the hardness of our heart was a concession of Moses to the human race, so too the eating of flesh was unknown until the deluge. But after the deluge, like the quails given in the desert to the murmuring people, the poison of flesh-meat was offered to our teeth.
The Apostle writing to the Ephesians teaches that God had purposed in the fullness of time to sum up and renew in Christ Jesus all things which are in heaven and in earth. Whence also the Saviour himself in the Revelation of John says, “I am Alpha and Omega, the beginning and the ending.” At the beginning of the human race we neither ate flesh, nor gave bills of divorce, nor suffered circumcision for a sign. Thus we reached the deluge. But after the deluge, together with the giving of the law which no one could fulfil, flesh was given for food, and divorce was allowed to hard-hearted men, and the knife of circumcision was applied, as though the hand of God had fashioned us with something superfluous.
But once Christ has come in the end of time, and Omega passed into Alpha and turned the end into the beginning, we are no longer allowed divorce, nor are we circumcised, nor do we eat flesh, for the Apostle says, “It is good not to eat flesh, nor to drink wine.” For wine as well as flesh was consecrated after the deluge.
Source: Against Jovinianus (New Advent)