Since, then, we know what it is to fear the Lord, we try to persuade others. What we are is plain to God, and I hope it is also plain to your conscience. We are not trying to commend ourselves to you again, but are giving you an opportunity to take pride in us, so that you can answer those who take pride in what is seen rather than in what is in the heart. If we are “out of our mind,” as some say, it is for God; if we are in our right mind, it is for you. For Christ’s love compels us, because we are convinced that one died for all, and therefore all died. And he died for all, that those who live should no longer live for themselves but for him who died for them and was raised again. So from now on we regard no one from a worldly point of view. Though we once regarded Christ in this way, we do so no longer.

Corinthians 5: 11-16

16-17 “Even though we once regarded Christ from a human point of view”: Paul seems to be referring to knowledge based only on external appearances and on human criteria. Paul’s Judaizing opponents do look on things from a human point of view, as Paul himself did before his conversion. Nothing he says here can be taken as implying that St Paul knew Jesus personally during his life on earth (he goes on to say that now he does not know him personally); what he is saying is that previously he judged Christ on the basis of his own Pharisee prejudices; now, on the other hand, he knows him as God and Savior of men.

In v. 17 he elaborates on this contrast between before and after his conversion, as happens to Christians through Baptism. For through the grace of Baptism a person becomes a member of Christ’s body, he lives by and is “in Christ” (cf., e.g., Gal 6:15; Eph 2:10, 1Sf; Cor 3:9f); the Redemption brings about a new creation. Commenting on this passage St Thomas Aquinas reminds us that creation is the step from non-being to being, and that in the supernatural order, after original sin, “a new creation was necessary, whereby (creatures) would be made with the life of grace; this truly is a creation from nothing, because those without grace are nothing (cf. 1 Cor 13:2) [. . .]. St Augustine says, ‘for sin is nothingness, and men become nothingness when they sin” (Commentary on 2 Cor, ad loc.).

“The new has come”: St John Chrysostom points out the radical change which the Incarnation of our Lord Jesus Christ has brought about, and the consequent difference between Judaism and Christianity: “Instead of the earthly Jerusalem, we have received that Jerusalem which is above; and instead of a material temple we have seen a spiritual temple; instead of tablets of stone, holding the divine Law, our own bodies have become the sanctuary of the Holy Spirit; instead of circumcision, Baptism; instead of manna, the Lord’s body; instead of water from a rock, blood from his side; instead of Moses’ or Aaron’s rod, the cross of the Savior; instead of the promised land, the kingdom of heaven” (Hom on 2 Cor, 11).

Catechism

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Baptism not only purifies from all sins, but also makes the neophyte "a new creature," an adopted son of God, who has become a "partaker of the divine nature,” member of Christ and co-heir with him, and a temple of the Holy Spirit.