3:12-18 It is the duty of the ministers of the gospel to use great plainness, or clearness, of speech. The Old Testament believers had only cloudy and passing glimpses of that glorious Saviour, and unbelievers looked no further than to the outward institution. But the great precepts of the gospel, believe, love, obey, are truths stated as clearly as possible. And the whole doctrine of Christ crucified, is made as plain as human language can make it. Those who lived under the law, had a veil upon their hearts. This veil is taken away by the doctrines of the Bible about Christ. When any person is converted to God, then the veil of ignorance is taken away. The condition of those who enjoy and believe the gospel is happy, for the heart is set at liberty to run the ways of God's commandments. They have light, and with open face they behold the glory of the Lord. Christians should prize and improve these privileges. We should not rest contented without knowing the transforming power of the gospel, by the working of the Spirit, bringing us to seek to be like the temper and tendency of the glorious gospel of our Lord and Saviour Jesus Christ, and into union with Him. We behold Christ, as in the glass of his word; and as the reflection from a mirror causes the face to shine, the faces of Christians shine also.

17. the Lord—Christ (2Co 3:14, 16; 2Co 4:5).

is that Spirit—is THE Spirit, namely, that Spirit spoken of in 2Co 3:6, and here resumed after the parenthesis (2Co 3:7-16): Christ is the Spirit and "end" of the Old Testament, who giveth life to it, whereas "the letter killeth" (1Co 15:45; Re 19:10, end).

where the Spirit of the Lord is—in a man's "heart" (2Co 3:15; Ro 8:9, 10).

there is liberty—(Joh 8:36). "There," and there only. Such cease to be slaves to the letter, which they were while the veil was on their heart. They are free to serve God in the Spirit, and rejoice in Christ Jesus (Php 3:3): they have no longer the spirit of bondage, but of free sonship (Ro 8:15; Ga 4:7). "Liberty" is opposed to the letter (of the legal ordinances), and to the veil, the badge of slavery: also to the fear which the Israelites felt in beholding Moses' glory unveiled (Ex 34:30; 1Jo 4:18).