After Jesus was crucified the angels predicted His Second Coming in Acts 1:11.
Acts 1:11 Which also said, Ye men of Galilee, why stand ye gazing up into heaven? this same Jesus, which is taken up from you into heaven, shall so come in like manner as ye have seen him go into heaven.
Then two chapters later Peter tells us when He will come back.
He tells us that Jesus will come into an individuals heart when they decide to “look for Him” or put their faith in Him, Acts 3:16, John 14:23.
Acts 3:20 And he shall send Jesus Christ, which before was preached unto you:
John 14:23 KJV — Jesus answered and said unto him, If a man love me, he will keep my words: and my Father will love him, and we will come unto him, and make our abode with him.
Hebrews 9:28 KJV — So Christ was once offered to bear the sins of many; and unto them that “look for him” shall he appear the second time without sin unto salvation.
Traditionalists can’t deal with this simple scriptural fact.
This fact is however evident if the references to the word “Spirit” from 2 Cor 3 are seen in order.
2Co 3:3 and you show that you are a letter from Christ delivered by us, written not with ink but with the Spirit of the living God, not on tablets of stone but on tablets of human hearts.
2Co 3:6 ¶ who has made us competent to be ministers of a new covenant, not in a written code but in the Spirit; for the written code kills, but the Spirit gives life.
2Co 3:8 will not the dispensation of the Spirit be attended with greater splendor?
2Co 3:17 Now the Lord is the Spirit, and where the Spirit of the Lord is, there is freedom.
2Co 3:18 And we all, with unveiled face, beholding the glory of the Lord, are being changed into his likeness from one degree of glory to another; for this comes from the Lord who is the Spirit.
(RSV)