The Apostle Paul
2 Corinthians 3:17ESV·traditional attribution

Now the Lord is the Spirit, and where the Spirit of the Lord is, there is freedom.

John Calvin Reformed @genevareformer

17. The Lord is the Spirit. This passage, also, has been misinterpreted, as if Paul had meant to say, that Christ is of a spiritual essence, for they connect it with that statement in John 4:24, God is a Spirit.

Matthew Henry Presbyterian @wholebiblehenry

In these verses the apostle draws two inferences from what he had said about the Old and New Testament: - I. Concerning the duty of the ministers of the gospel to use great plainness or clearness of speech. They ought not, like Moses, to put a veil upon their faces, or obscure and darken those things which they should make plain.

Commenting on 2 Corinthians 3:12-18

John Gill Reformed Baptist @doctorgill

Now the Lord is that Spirit,.... "The Lord", to whom the heart is turned, when the veil is removed, is Jesus Christ; and he is "that Spirit", or "the Spirit": he, as God, is of a spiritual nature and essence; he is a spirit, as God is said to be, Joh 4:24 he is the giver of the Spirit of God, and the very life...