In the end of the sabbath, as it began to dawn toward the first day of the week, came Mary Magdalene and the other Mary to see the sepulchre.  And, behold, there was a great earthquake: for the angel of the Lord descended from heaven, and came and rolled back the stone from the door, and sat upon it.  His countenance was like lightning, and his raiment white as snow: and for fear of Him the keepers did shake, and became as dead men.
Matthew 28:1-4

On the day of the resurrection of Jesus Christ it was a joyous occasion for all those who loved Him; but it does seem they were surprised by it.  Jesus had told them, many times that He would be put to death and on the third day He would rise again.
Some how they did not understand that the Messiah would die, and be raised to life again.  Now, because Jesus has arisen His disciples will believe, because they have seen Him; yet, Jesus says in the Gospel of John, “Blessed are those who have not seen, and yet have believed.” John 20:29.  That means even you and me, all who believe today.
We solely believe the written, inspired, inerrant word of God to be true in every thing  it tells us about Jesus; the whole counsel of God.  The resurrection of Jesus Christ secures for us assurance that we too will experience resurrection.