Now the Lord is that Spirit:
and where the Spirit of the Lord is,
there is liberty.
2 Corinthians 3:17
When any particular person is converted to God, then the veil of ignorance is taken away; the blindness of the mind, and the hardness of the heart, are cured. 2. The condition of those who enjoy and believe the gospel is much more happy. For, (1.) They have liberty: Where the Spirit of the Lord is, and where he worketh, as he does under the gospel-dispensation, there is liberty (v. 17), freedom from the yoke of the ceremonial law, and from the servitude of corruption; liberty of access to God, and freedom of speech in prayer. The heart is set at liberty, and enlarged, to run the ways of God’s commandments. (2.) They have light; for with open face webehold the glory of the Lord, v. 18. The Israelites saw the glory of God in a cloud, which was dark and dreadful; but Christians see the glory of the Lord as in a glass, more clearly and comfortably. It was the peculiar privilege of Moses for God to converse with him face to face, in a friendly manner; but now all true Christians see him more clearly with open face. He showeth them his glory. (3.) This light and liberty are transforming; we are changed into the same image, from glory to glory (v. 18), from one degree of glorious grace unto another, till grace here be consummated in glory for ever. How much therefore should Christians prize and improve these privileges! We should not rest contented without an experimental knowledge of the transforming power of the gospel, by the operation of the Spirit, bringing us into a conformity to the temper and tendency of the glorious gospel of our Lord and Saviour Jesus Christ. (from Matthew Henry Commentary)