Hebrews 10: 7 Then said I, Lo, I come (in the volume of the book it is written of me,) to do thy will, O God.
The whole of the Old Testament, the volume of the book as it is written of me, was speaking of the coming of Christ. When it is says the gospel of God which was promised afore by His prophets, these words spoke of Christ. The whole of the Old Testament made way for Christ and what He would come to do. Look in Isaiah 53.
Isaiah 53:5 But he was wounded for our transgressions, he was bruised for our iniquities: the chastisement of our peace was upon him; and with his stripes we are healed. 6 All we like sheep have gone astray; we have turned every one to his own way; and the Lord hath laid on him the iniquity of us all. 7 He was oppressed, and he was afflicted, yet he opened not his mouth: he is brought as a lamb to the slaughter, and as a sheep before her shearers is dumb, so he openeth not his mouth. 8 He was taken from prison and from judgment: and who shall declare his generation? for he was cut off out of the land of the living: for the transgression of my people was he stricken. 9 And he made his grave with the wicked, and with the rich in his death; because he had done no violence, neither was any deceit in his mouth. 10 Yet it pleased the Lord to bruise him; he hath put him to grief: when thou shalt make his soul an offering for sin, he shall see his seed, he shall prolong his days, and the pleasure of the Lord shall prosper in his hand. 11 He shall see of the travail of his soul, and shall be satisfied: by his knowledge shall my righteous servant justify many; for he shall bear their iniquities.
I cannot think of any other portion of the Old Testament that speaks of the plan of God regarding salvation than this chapter in Isaiah. This was the promise of the Old Testament that the suffering servant would come and would justify many. By bearing the iniquities of the many, He justified them. This plan of salvation included a definite savior described in Isaiah 53:2 as a tender plant, and as a root out of a dry ground. This plan included definite people described in in Isaiah 53:1 as to whom the arm of the Lord is revealed, 53:2 as we, 53:3 as we, 53:4 our griefs and our sorrows, 53:5 our transgressions and our iniquities and our peace, 53:6 we and us all, 53:8 my people, and 53:11 many and their. There was a definite means described in 53:4 as He bore our griefs and carried our sorrows, smitten and afflicted, 53:5 wounded and bruised and chastisement upon Him and stripes, 53:7 He was oppressed and afflicted, 53:8 He was cut off out of the land of the living and stricken, 53:10 He was bruised and put to grief, 53:11 He experienced travail. There was a definite and complete salvation described in 53:11 as justifying many. The definite man Christ saved His definite people through the definite means of suffering which yielded a definite salvation. Look to the gospel of John.
John 6:37 All that the Father giveth me shall come to me; and him that cometh to me I will in no wise cast out. 38 For I came down from heaven, not to do mine own will, but the will of him that sent me. 39 And this is the Father’s will which hath sent me, that of all which he hath given me I should lose nothing, but should raise it up again at the last day.
Christ came to do the will of the Father. All the Father gave to Him would come. None given would be cast out. All of whom the Father gave He would lose none. We see the definite people here. Would Christ die for all? Only if all were given. For Christ to die for any more than the Father gave is contradictory to scripture. Christ would not do anything apart from the will of God. If Christ died for all then none of any generation would be lost and hell would not be a reality for any of mankind. Jesus is speaking of the definite redemption that He came to perform.