He said something to the effect that if someone is predestined by God to be baptized. we should not say that it might not happen.
HUH? God's will is thwarted all the time. Jesus said, "Unless you do the will of the Father, you [won't get to Heaven]" (paraphrase)
So St Augustine was off on that comment
Jesus also said that FEW make it to Heaven (Mt 7:13, Lk 13:24), so obviously God's will is thwarted more often than it is ACCOMPLISHED