The sixty-six books of the Bible, written over a period of more than 1600 years by over forty different men, has One Message, one theme: SALVATION IN CHRIST. From the Patriarchal Age through the Prophectic Age to the Christian Age - in the Old Covenant and in the New Covenant (Old Testament and New Testament) - from Genesis to Revelation, all points toward the reconciliation of man with God through Jesus of Nazareth, the only begotten Son of God, the Christ.
The theme can be seen in the three 3:16's:
Galatians 3:16 the promise of the seed
Now to Abraham and his seed were the promises made. He saith not, And to seeds, as of many; but as of one, And to thy seed which is Christ.
Beginning with the statement to the serpent, the promise of the Seed is repeatedly made to Abraham, Isaac, Jacob, David and Solomon, [see Genesis 3: ; 22:18; 26:4; 28:14; etc.] Genesis 22:18 - And in thy seed shall all the nations of the earth be blessed; because thou hast obeyed my voice.
The Holy One of Promise spoken of from the beginning was Jesus of Nazareth.
Acts 3:22-26 - For Moses truly said unto the fathers, A prophet shall the Lord your God raise up unto you of your brethren, like unto me; him shall ye hear in all things whatsoever he shall say unto you. And it shall come to pass, that every soul, which will not hear that prophet, shall be destroyed from among the people. Yea, and all the prophets from Samuel and those that follow after, as many as have spoken, have likewise foretold of these days. Ye are the children of the prophets, and of the covenant which God made with out fathers, saying unto Abraham, And in thy seed shall all the kindreds of the earth be blessed. Unto you first God, having raised up his Son Jesus, sent him to bless you, in turning away every one of you from his iniquities.
Every prophecy, from the birth to the teaching and wonder working to the passion, death and resurrection of Jesus, and its correspondent fulfillment in the New Testament, the writings of Moses and the prophets together with that of the apostles and evangelists are written with the singular theme of the salvation of Jesus Christ as the Holy One of Promise.
1 Timothy 3:16 the mystery of godliness
And without controversy, great is the mystery of godliness: God was manifested in the flesh, justified in the Spirit, seen of angels, preached unto the Gentiles, believed on in the world, received up into glory.
Three of the Gospels begin with a statement of who Jesus is:
Matthew 1:1- The book of the generation of Jesus Christ, the son of David, the son of Abraham.
Mark 1:1 - The beginning of the gospel of Jesus Christ, the Son of God; John 1:1,14 - In the beginning was the Word, and the Word was with God, and the Word was God... And the Word was made flesh, and dwelt among us, (and we beheld his glory, the glory as of the only begotten of the Father) full of grace and truth.
God became flesh in Jesus of Nazareth. Humanity achieved a sinless condition. Therefore, the perfect sacrifice for sin could be made. In Jesus:
Ephesians 1:7 - we have redemption through his blood, the forgiveness of sins, according to the riches of his grace
Hebrews 9:11-15 - But Christ, being come an high priest of good things to come, by a greater and more perfect tabernacle,not made with hands, that is to say, not of htis building; neither by the blood of goats and calves, but by his own blood he entered in once into the holy place, having obtained eternal redemption for us. For if the blood of bulls and of goats, and the ashes of an heifer sprinkling the unclean, sanctifieth to the purify of the flesh: how much more shall the blood of Christ, who through the eternal Spirit offered himself without spot to God, purge your conscience from dead works to serve the living God? And for this cause he is the mediator of the new testament, that by means of death,for the redemption of the transgressions that were under the first testament, they which are called might receive the promise of eternal inheritance... And as it is appointed unto men once to die, but after this the judgment: 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.
Every sacrifice that was lifted up from the ground and offered for the sins and transgressions of man from Abel to the last of the sacrifices offered in the temple at Jerusalem, looked to the time when Jesus would be lifted up from the earth. From Abel to Abraham to David to Isaiah to Malachi, every righteous individual under the Old Covenant was cleansed by the blood of Jesus, just as every person under the New Covenant, whether it be Peter, Paul, Apollos r the last Christian to walk upon the face of the earth.
Jesus arose from the grave to sit upon the throne of God, reigning as the Lord of lords and the King of kings, in the kingdom of God and of his Christ, the Lord's house, the church, which would be a place where all would be able to find salvation, whether they were Jews or Gentiles.
Isaiah 2:2 - And it shall come to pass in the last days, that the mountain of the Lord's house shall be established in the top of the mountains, and shall be exalted above the hills; and all nations shall flow into it.
1 Timothy 3:15 - But if I tarry long, that thou mayest know how thou oughtest to behave thyself in the house of God, which is the church of the living God, the pillar and ground of the truth.
Hebrews 12:22-23,28 - But ye are come unto Mount Sion, and unto the city of the living God, the heavenly Jerusalem, and to an innumerable company of angels, to the general assembly and church of the firstborn, which are written in heaven, and to God the Judge of all, and to the spirits of just men made perfect, and to Jesus... Wherefore we receiving a kingdom which cannot be moved, let us have grace, whereby we may serve God acceptably with reverence and godly fear:
John 3:16 the promise of eternal life
For God so loved the world, that he gave his only begotten Son, that whosoever believeth in him should not perish, but have everlasting life. For God sent not his Son into the world to condemn the world; but that the world through him might be saved.
God's love and care for man are seen throughout the historical narrative of the Bible. His care for Adam and Eve ~ both before and after the first sin, his protection of Noah and his family from the destruction of the flood, his constant care of the patriarchs, his patience and provision for the nation of Israel in the wilderness and in the promised land, his comfort and care of Paul and companions on the missionary joumies, every era and covenant is replendent with examples of his loving care and concern with mankind. And, the culmination of this concern is seen in the provision of salvation in Jesus Christ. All of the Bible revolves around the cross. The love of God is so great for mankind that he allowed his Son to die upon Golgatha that we might live with him for eternity. From Genesis to Revelation, reconciliation is its purpose. The story of God's relationship with man is one of love reaching out. God has offered man salvation and eternal life, making every provision for it. He has sought to save man, not condemn him. Man condemns himself through his sin.
1 Peter 1:3-12 - Blessed be the God and Father of ou Lord Jesus Christ, which according to his abundant mercy hath begotten us again unto a lively hope by the resurrection of Jesus Christ from the dead, to an inheritance incorruptable, and undefiled, and that fadeth not away, reserved in heaven for you, who are kept by the power of God through faith unto salvation ready to be revealed in the last time. Wherein ye greatly rejoice, though now for a season, if need be, ye are in heaviness though manifold temptations: that the trial of your faith, being much more precious than of gold that perisheth, though it be tried with fire, might be found unto praise and honour and glory at the appearing of Jesus Christ: whom having not seen, ye love; in whom, though now ye see him not, ye believing, ye rejoice with joy unspeakable and full of glory; receiving the end of your faith, even the salvation of your souls. Of which salvation the prophets have inquired and searched diligently, who prophesied of the grace that should come unto you: searching what or what manner of time the Spirit of Christ which was in them did signify, when it testified beforehand the sufferings of Christ, and the glory that should follow. Unto whom it was revealed, that not unto themselves, but unto us they did minister the things, which are now reported unto you by them that have preached the gospel unto you with the Holy Ghost sent down from heaven; which things the angels desire to look into.
the conclusion: fear God and keep his commandments
Ecclesiastes 12:13,14 - Let us hear the conclusion of the whole matter: Fear God, and keep his commandments: for this is the whole duty of man. For God shall bring every work into judgment, with every secret thing, whether it be good, or whether it be evil.
The meaning and purpose of life is preparation for eternity. Its preparation is done in respectful obedience, trusting in the mercy and grace of God through Jesus Christ. That has not changed in the entire span of scripture.
John 1:1 - In the beginning was the Word, and the Word was with God, and the Word was God.
To fear God is to fear Jesus. To keep God's commandments is to keep Jesus' commandments.
As Jesus said:
Luke 6:46 - And why call ye me, Lord, Lord, and do not the things which I say?
John 14:15 - If ye love me, keep my commandments.
John 15:9-10,14 - As the Father hath love me, so have I lovedyou: continue ye in my love. If ye keep my commandments, ye shall abide in my love; even as I have kept my Father's commandments, and abide in his love... Ye are my friends, if ye do whatsoever I command you.
1 John 5:1-3 - Whosoever believeth that Jesus is the Christ is born of God: and every one that loveth him that begat loveth him also that is begotten of him. By this we know that we love the children of God, when we love God, and keep his commandments. For this is the love of God, that we keep his commandments: and his commandments are not grievous.