The Second Epistle of Paul the Apostle to the CorinthiansChapter 3 Verse 18
18 But we all behold as in a mirror the glory ofthe Lord with open face, and are changed into thesame image, from glory to glory, as by the Spirit ofthe Lord.
Related Scripture
1 Corinthians 13:12;  2 Corinthians 4:4, 6; Romans 8:29-30; Colossians 3:10; Ephesians 4:23-24;Ecclesiastes 8:1;  
Suggested additional reading Ephesians 4

The Second Epistle of Paul the Apostle to the CorinthiansChapter 3 Verse 16
16 Nevertheless when their heart shall be turnedto the Lord, the veil shall be taken away. (a)
(a) Editor’s note - The veil of the temple separated the Holy of Holies from the people. In effect, it said that one could not approach the throne of God, (for our sins were such that God could not accept us in our imperfection), wherein was kept the mercy seat. Once our Savior died and became the sacrifice for all of our sins that curtain, that veil, was removed once and forever thus saying that our Creator has redeemed us from the curse of the Law. 
Related Scripture
Matthew 27:51;  Mark 15:38; Luke 23:45;  Exodus 26:31-37; Romans 11:23; Isaiah 25:7; Ephesians 4:18; 
Suggested additional reading Romans 11

The Second Epistle of Paul the Apostle to the CorinthiansChapter 3 Verses 14-15
14 Therefore their minds are hardened: for untilthis day remaineth the same covering untaken awayin the reading of the old Testament, which veil inChrist is put away.15 But even unto this day, when Moses is read,the veil is laid over their hearts
Related Scripture
Isaiah 6:10; Isaiah 29:10; Acts 28:26; Romans 11:7-8; 1 Samuel 6:6; Psalm 81:12; Isaiah 44:18; Hebrews 3:15; John 12:40; 2 Timothy 3:8; Matthew 13:13-15; 

Realizing God's Plan In Life (Part Six)
by Archibald T. Robertson
Edited by R.P. Woitowitz Sr.

12 Wherefore my beloved, as ye have always obeyed me, not as in my presence only, but now
much more in mine absence, so make an end of your own salvation with fear and trembling.
13 For it is God which worketh in you both the will and the deed, even of his good pleasure.
14 Do all things without murmuring and reasonings,
15 That ye may be blameless, and pure, and the sons of God without rebuke in the midst of
a naughty and crooked nation, among whom ye shine as blights in the world,
16 Holding forth the word of life, that I may rejoice in the day of Christ, that I have not run in vain, neither have labored in vain.
17 Yea, and though I be offered up upon the sacrifice, and service of your faith, I am glad, and
rejoice with you all.
18 For the same cause also be ye glad, and rejoice with me.

The Epistle of Paul the Apostle to the Philippians Chapter 2 Verses 12-18

Mutual Joy (verses 17-18)

"I joy and rejoice with you all," says Paul. He is glad by himself to make the offering of his life, if this supreme sacrifice is demanded. He will not shrink back, but will meet it gladly, and all the more readily since he can share his joy with them. Fellowship is a blessed reality. Paul is glad on his own account that he has been the instrument in their salvation . He is still more joyful at the experiences of grace which they have in Christ. Joy is not selfish, but wishes company. The woman in who found her lost piece of money called in her women friends and said: "Rejoice with me, for I have found the piece which I had lost." So the shepherd who found the one lost sheep said to his friends: "Rejoice with me, for I have found my sheep which was lost" So the father says: "Make merry, for this my son was dead, and is alive again; he was lost, and is found." (Luke 15:6, 9, 20-24). The child all aglow with his Christmas toys wishes other children to come and share his joys. "And in the same manner do ye also joy, and rejoice with me." Play up to your part of the joy. Plutarch tells of the messenger from Marathon who expired on the first threshold in Athens with these words on his lips: "Rejoice and we rejoice." Nowhere in the Epistle is Paul so insistent about joy as here. The Christian is rich in his joy in Christ. What joy it will be in heaven to tell the story of the triumph of Christ over sin in your life and in mine. ( Isaiah 61:10; Job 33:26; Romans 14:17)

The Second Epistle of Paul the Apostle to the CorinthiansChapter 3 Verses 9, 11
9 For if the ministry of condemnation wasglorious, much more doth the ministration ofrighteousness exceed in glory.11 For if that they should be abolished, wasglorious, much more shall that which remaineth beglorious.
Related Scripture
Romans 1:16-19; Romans 3:19-25; Romans 9:30; Acts 15:5-19;
Suggested additional reading Galatians 3

46 For in the days of David and Asaph, of old werechief singers, and songs of praise and thanksgivingunto God.Nehemiah 12:46

The Second Epistle of Paul the Apostle to the CorinthiansChapter 3 Verses 3, 6
3 In that ye are manifest, to be the Epistle ofChrist, ministered by us, and written, not with ink,but with the Spirit of the living God, not in tablesof stone, but in fleshly tables of the heart.6 Who also hath made us able ministers of theNew Testament, not of the letter, but of the Spirit:for the letter killeth, but the Spirit giveth life.
Editor’s thought - The OT was of the law, that is to say it was a guide unto the coming of the promise made by God to raise up a redeemer; Jesus Christ, and from thereon the NT would be known by all peoples, as it was written on one’s heart, and one would know what was right and wrong instinctively. 
Related Scripture
Psalm 40:3; Psalm 51:10; Acts 13:22; 1 Samuel 13:14; Jeremiah 31:31-33; Jeremiah 32:40; Jeremiah 33:14-15; Ezekiel 11:19-20; Ezekiel 36:26-27;  Matthew 26:28; Hebrews 8:8-13; Hebrews 10:16-17; Hebrews 12:24; 
Suggested additional reading Hebrews 8