1. Behold, now is the accepted time; behold, now is the day of salvation. (2 Co 6:1-2)
    Lk 4:16-19, Isa 61:1, Isa 52:7, Isa 55:6, Heb 3:7-8, Heb 4:7, Acts 5:42, 1 Thess 5:2-3

The Old Testament tells us that the time when Christ came to preach the gospel is the day of grace and salvation. And the Old Testament tells us to listen to the voice of Christ. (Isa 61:1, Isa 52:7-10, Isa 55:6, Heb 3:7-8, Heb 4:7)

Isa 61:1 The Spirit of the Lord God is upon me; because the Lord hath anointed me to preach good tidings unto the meek; he hath sent me to bind up the brokenhearted, to proclaim liberty to the captives, and the opening of the prison to them that are bound;

Isa 52:7 How beautiful upon the mountains are the feet of him that bringeth good tidings, that publisheth peace; that bringeth good tidings of good, that publisheth salvation; that saith unto Zion, Thy God reigneth!
8 Thy watchmen shall lift up the voice; with the voice together shall they sing: for they shall see eye to eye, when the Lord shall bring again Zion.
9 Break forth into joy, sing together, ye waste places of Jerusalem: for the Lord hath comforted his people, he hath redeemed Jerusalem.
10 The Lord hath made bare his holy arm in the eyes of all the nations; and all the ends of the earth shall see the salvation of our God.

Isa 55:6 Seek ye the Lord while he may be found, call ye upon him while he is near:

Heb 3:7 Wherefore (as the Holy Ghost saith, To day if ye will hear his voice,
8 Harden not your hearts, as in the provocation, in the day of temptation in the wilderness:

Heb 4:7 Again, he limiteth a certain day, saying in David, To day, after so long a time; as it is said, To day if ye will hear his voice, harden not your hearts.

Christ has come and preached the gospel of Christ. Now we are preaching the gospel of Christ, that Jesus is the Christ. (Lk 4:16-19, Acts 5:42)

Lk 4:16 And he came to Nazareth, where he had been brought up: and, as his custom was, he went into the synagogue on the sabbath day, and stood up for to read.
17 And there was delivered unto him the book of the prophet Esaias. And when he had opened the book, he found the place where it was written,
18 The Spirit of the Lord is upon me, because he hath anointed me to preach the gospel to the poor; he hath sent me to heal the brokenhearted, to preach deliverance to the captives, and recovering of sight to the blind, to set at liberty them that are bruised,
19 To preach the acceptable year of the Lord.

Acts 5:42 And daily in the temple, and in every house, they ceased not to teach and preach Jesus Christ.

The gospel that Jesus is the Christ must be heard now, the time of grace and salvation. You never know when the Lord will come again. (2 Co 6:1-2, 1 Thess 5:2-3)

2 Co 6:1 We then, as workers together with him, beseech you also that ye receive not the grace of God in vain.
2 (For he saith, I have heard thee in a time accepted, and in the day of salvation have I succoured thee: behold, now is the accepted time; behold, now is the day of salvation.)

1 Thess 5:2 For yourselves know perfectly that the day of the Lord so cometh as a thief in the night.
3 For when they shall say, Peace and safety; then sudden destruction cometh upon them, as travail upon a woman with child; and they shall not escape.