Heb 10:14 - For by one offering He has perfected forever those who are being sanctified.

John 1:12 - But as many as received Him, to them He gave the right to become children of God.

I Peter 1:3-9
3 Blessed be the God and Father of our Lord Jesus Christ, who according to His abundant mercy has begotten us again to a living hope through the resurrection of Jesus Christ from the dead,
4 to an inheritance incorruptible and undefiled and that does not fade away, reserved in heaven for you,
5 who are kept by the power of God through faith for salvation ready to be revealed in the last time.
6 In this you greatly rejoice, though now for a little while, if need be, you have been grieved by various trials,
7 that the genuineness of your faith, being much more precious than gold that perishes, though it is tested by fire, may be found to praise, honor, and glory at the revelation of Jesus Christ,
8 whom having not seen you love. Though now you do not see Him, yet believing, you rejoice with joy inexpressible and full of glory,
9 receiving the end of your faith; the salvation of your souls.

Notes:

1) Jesus Christ has purchased a "contract" with His blood, from God, Inc. (A company in which He is a full partner.) for our salvation.

2) We have nothing with which we could pay for this contract - even to offer the miserable pocket change of our efforts is an insult to the price Jesus paid.

3) We must co-sign this contract since it represents a major change in our eternal destiny. To do so, we must first understand what is offered in some limited way, believe the offer is genuine, and accept it, ie receive Him.

Luke 23:43 - And Jesus said to him, "Assuredly, I say to you, today you will be with Me in Paradise."

Note: Even though nailed to a cross, the criminal was able to do what was required to accept the contract. God provided the two criminals at the crucifixion to represent to us ALL mankind - saved and lost.

Heb 10:36-39
36 For you have need of endurance, so that after you have done the will of God, you may receive the promise:
37 "For yet a little while, And He who is coming will come and will not tarry.
38 Now the just shall live by faith; But if anyone draws back, My soul has no pleasure in him."
39 But we are not of those who draw back to perdition, but of those who believe to the saving of the soul.

Col 1:28 Him we preach, warning every man and teaching every man in all wisdom, that we may present every man perfect in Christ Jesus.

Note: The contract is listed in John 17 and includes eternal life, knowing God, protection by God, hate from the world, oneness, glory, being made perfect, being with Jesus one day, and being filled with God's love, among other things.
A big benefit is that we get to be with Jesus when we die. Every day I ask Him if I can go yet, but He says wait, my purpose here is not finished yet. So I try to learn how to be in His presence all the time even though I am here in this world, like Elijah says in I Kings 18:15 -
Then Elijah said, "As the LORD of hosts lives, before whom I stand, ..."
While we are still here, we are being transformed to be like Jesus, as long as we agree to the contract. If we lose hope and reject the contract, we "draw back to perdition" and are lost or perhaps suffer loss and are saved "as through fire" like in I Cor 3:15 - If anyone's work is burned, he will suffer loss; but he himself will be saved, yet so as through fire.

I John 2:12-13
12 I write to you, little children, Because your sins are forgiven you for His name's sake.
13 I write to you, fathers, Because you have known Him who is from the beginning. I write to you, young men, Because you have overcome the wicked one. I write to you, little children, Because you have known the Father.

Note: The processes and purposes of salvation are shown in many stories from Genesis to Revelation, but sometimes I get confused because the scriptures almost seem contradictions or paradoxes. I am beginning to understand that we go through 3 major steps of salvation in our walk with the Lord and thus there are several audiences as John in the above scripture lists the believers explicitly. We start as little children, for we must become as such to enter the Kingdom of God, but He does not want us to stay there as sinners forgiven for His name's sake.
We go on to overcome the wicked one in the desert, like Jesus did after being baptized in water and the Spirit, but He still calls us to go on and know the fellowship of His suffering and be perfected as He was in the refining fire:

Heb 2:10 For it was fitting for Him, for whom are all things and by whom are all things, in bringing many sons to glory, to make the captain of their salvation perfect through sufferings.

Philipians 3:
8 Yet indeed I also count all things loss for the excellence of the knowledge of Christ Jesus my Lord, for whom I have suffered the loss of all things, and count them as rubbish, that I may gain Christ
9 and be found in Him, not having my own righteousness, which is from the law, but that which is through faith in Christ, the righteousness which is from God by faith;
10 that I may know Him and the power of His resurrection, and the fellowship of His sufferings, being conformed to His death,
11 if, by any means, I may attain to the resurrection from the dead.

Contract part two