The Apostle Paul
Ephesians 3:12BSB·traditional attribution

In Him and through faith in Him we may enter God’s presence with boldness and confidence.

John Calvin Reformed @genevareformer

12. Through whom we have boldness. The honor of reconciling the Father to the whole world must be given to Christ. From the effects of this grace its excellence is demonstrated; for faith, which is possessed by Gentiles in common with Jews, admits them into the presence of God.

Matthew Henry Presbyterian @wholebiblehenry

Here we have the account which Paul gives the Ephesians concerning himself, as he was appointed by God the apostle of the Gentiles. I. We may observe that he acquaints them with the tribulations and sufferings which he endured in the discharge of that office, Eph 3:1. The first clause refers to the preceding chapter, and may be understood either of these two ways: - 1.

Commenting on Ephesians 3:1-13

John Gill Reformed Baptist @doctorgill

In whom we have boldness and access,.... Into the holy of holies, to the throne of grace there, and to God the Father, as seated on it: Christ is the way of access; union to him gives right of access; through his mediation his people have audience of God, and acceptance with him, both of person and service: and this access is with boldness; which...