Tim Keller tells the following story about the power of Christ's resurrection:
A minister was in Italy, and there he saw the grave of a man who had died centuries before who was an unbeliever and completely against Christianity, but a little afraid of it too. So the man had a huge stone slab put over his grave so he would not have to be raised from the dead in case there is a resurrection from the dead. He had insignias put all over the slab saying, "I do not want to be raised from the dead. I don't believe in it." Evidently, when he was buried, an acorn must have fallen into the grave. So a hundred years later the acorn had grown up through the grave and split that slab. It was now a tall towering oak tree. The minister looked at it and asked, "If an acorn, which has power of biological life in it, can split a slab of that magnitude, what can the acorn of God's resurrection power do in a person's life?"
Keller comments:
The minute you decide to receive Jesus as Savior and Lord, the power of the Holy Spirit comes into your life. It's the power of the resurrection—the same thing that raised Jesus from the dead …. Think of the things you see as immovable slabs in your life—your bitterness, your insecurity, your fears, your self-doubts. Those things can be split and rolled off. The more you know him, the more you grow into the power of the resurrection.