The resurrection of Jesus Christ was the pivotal event in human history.
Because of the fall of Adam, man was separated from God. No system of works or religious piety would be enough to fill that chasm. While the first Adam failed miserably, the second Adam, Jesus Christ, triumphed over sin, Satan and the last enemy, death.
For those who believe in Him and are his disciples, He purchased our salvation by His immeasurable sacrifice and He rose again for our justification. He has given us the gift of everlasting life!
I Corinthians 15
21 For since by man came death, by man came also the resurrection of the dead.
22 For as in Adam all die, even so in Christ shall all be made alive.
"Jesus Christ, completely justified, rises to prove that all his people are, in him, completely justified, and the work of salvation is for ever perfect. The stone is rolled from the door of the sepulchre, as if to show that Jesus has so effectually done the work that nothing can shut us up in the grave again. The grave has changed its character; it has been altogether annihilated, and put away as a prison-house, so that death to the saints is no longer a punishment for sin, but an entrance into rest. Come, brethren, let us rejoice in this." -- C. H. Spurgeon