After considering who Jesus was, we are in a better position to understand what He came to do for us.
Satan made accusations against God. In order to meet those accusations, Jesus came to represent the Father’s character, and to correct the false concept that many had developed about the Godhead. He wanted us to know God, because to know Him is indispensable in order to have eternal life (John 17:3). However, we need more than knowledge to be saved. We need God to provide us a Savior, which is precisely the meaning of the name Jesus: Yahweh is salvation (Matt. 1:21). Jesus described His mission in very clear terms: the Son of Man has come to seek and to save that which was lost (Luke 19:10, NKJV). In Eden, humans lost their relationship with God, lost their holiness, lost their home, and lost eternal life. Jesus came to restore everything: He reestablishes our relationship with the Father (John 1:51); He forgives us our sins (Matt. 26:28); He gives us an example how to live (1 Pet. 2:21); and, of course, He gives us eternal life (John 3:16).
Why did Jesus have to die? It was because He voluntarily took our place and bore the punishment of our sin. We are all sinners (Rom. 3:10-12) and, as such, deserve eternal death (Rom. 6:23). The price for our salvation was so high that only the life of the Son of God was enough to pay for it.
The broken law of God demanded the life of the sinner. In all the universe there was but one who could, in behalf of man, satisfy its claims. Since the divine law is as sacred as God Himself, only one equal with God could make atonement for its transgression. None but Christ could redeem fallen man from the curse of the law and bring him again into harmony with Heaven. — Ellen G. White, Patriarchs and Prophets, p. 63.
Look around at our world and the fate of us all in this world. If everything ended in the grave, what hope would we have? We would have none at all, were it not for the plan of salvation. How, then, can we show our gratefulness to God for what He has done for us in Christ?