4:23-25 What do we learn from what Paul says here?

We learn from this that God's promise to Abraham has been fulfilled in Jesus Christ.

Every repentant sinner becomes a child of God and heir of the promise through faith in Jesus (CP V11-13 with Ga 3:26-29).

Christ's resurrection ensures our justification.

If he had not been resurrected we would still be under condemnation for sin (CP Jn 14:19 with 1Cor 15:12-17).