‘And they found the stone rolled away from the sepulchre’, rolled away of course by the power of God. It was not only the power of God, but the great kindness of God that this happened, because really there was absolutely no need for that stone to be rolled away in order for the resurrection to take place.
It is the same with conversion. We hear the gospel, we hear that we can have pardon and forgiveness for our sins, we hear that God will touch our lives and transform us, but right up until the very point that we begin to experience and taste that salvation and that renewal of life, it hasn't really come home to us what that will involve: that our whole mind and outlook, our affections will be changed, our character will be changed. The natural man finds it very hard to understand the mighty acts of God: that God does things beyond our comprehension, beyond the things that we could do or imagine or do for ourselves.