In whom we have our boldness and access. παῤῥησία literally means "boldness" or "freedom of speech," but is used here in a more ample sense for want of restraint, ease of feeling, comfortable self-possession, in our access to God.
Contrast with Adam hiding himself among the trees of the garden, and the lost calling on the mountains to fall on them, and the rocks to cover them. The "we" in this verse includes both Jews and Gentiles.
The "access," or introduction (see Ephesians 2:18), is like that of the high priest into the holy of holies—we have boldness to enter into the holiest of all (Hebrews 10:19). In confidence through the faith of him.
The confidence of being welcomed and accepted when we go into God's presence springs from our faith in him. We believe in him as the Propitiation, as our Peace, as the Reconciler, and we go before God with confidence.
The clause, "through faith in him," influences the whole verse. And, as before, we have at the beginning of the verse, "in whom"—an express-ion denoting generally our union with Christ, and at the end, "through the faith of him"—a specification of the instrument by which flint union is formed and by which it operates.