Jesus said "I and my Father are one" (John 10:30). Jesus, also called the "Word," existed with God from the beginning, and actually was the Creator as explained in John 1:1-3: "In the beginning was the Word, and the Word was with God, and the Word was God. The same was in the beginning with God. All things were made by him; and without him was not any thing made that was made." Here are a few other verses showing Jesus existed with the Father even before the creation, and was the One through whom creation took place:
For several reasons (and according to God's plan, Rev. 13:8) the Word was made human in the form we know as Jesus: "And the Word was made flesh, and dwelt among us" (John 1:14). Jesus said of His mission to mankind: "the Father which sent me, he gave me a commandment, what I should say, and what I should speak" (John 12:49). Jesus explained "For I am come down from heaven, not to do mine own will, but the will of him that sent me" (John 6:38).
Jesus preached the gospel - the good news - of the kingdom of God. Jesus "went throughout every city and village, preaching and showing the glad tidings of the kingdom of God" (Luke 8:1).
Jesus also fulfilled many Old Testament prophecies, including Hosea 13:14: "I will ransom them from the power of the grave; I will redeem them from death." Jesus spoke of himself saying "the Son of man came not to be ministered unto, but to minister, and to give his life a ransom for many" (Matthew 20:28). Jesus' sacrificial death paid the penalty (which is death, see Romans 6:23) for our sin, making possible - if we repent - our redemption to God and the gift of eternal life. By paying the penalty for our sin on our behalf Jesus has freed us from the power of the grave: eternal life is now available for us.
The gospel of grace is the good news that redemption, resurrection and eternal life have been provided for us. No amount of works - good deeds - can earn redemption and eternal life: they are provided by grace, by the gift of God, but only if we choose to repent and choose to develop a right relationship with God.
Jesus' work of creation is not finished: He promised to lead us, to dwell in us, to walk in us, to abide in us, and to manifest or reveal Himself to us if we are willing to repent, follow and overcome:
After His resurrection Jesus appeared to His disciples: "And Jesus came and spake unto them, saying, All power is given unto me in heaven and in earth" (Matthew 28:18). Jesus said "For the Father judgeth no man, but hath committed all judgment unto the Son: That all men should honour the Son, even as they honour the Father (John 5:22,23). Jesus has authority over all creation, and has been authorized to judge all men. We can relate to Jesus as we would to the Father; the Father has given Jesus all power over us.
Jesus promised to return. When He returns He will fully assume over all the world the authority God has given Him. Isaiah 2:4 is one of many prophecies about His kingdom:
Jesus will remain in full authority until His work is done, then He will return all authority back to the Father: