Can you even imagine what it must have been like for Jesus to simply materialize in a locked room? Visions of Star Trek transports come to mind. I know that I would have been freaked out. Luke adds to the record of this event reporting how Jesus said:
"Why are you troubled, and why do doubts arise in your hearts?"Isn't that the way that we so often deal with things that our brain cannot comprehend? When something unexplainable happens we are troubled and have difficulty believing - things that seem too good to be true are often hard to believe. To comfort them Jesus speaks peace and shows them his wounds. In Luke's account he even eats a meal to show he was real.
And how interesting that the Lord's first message to them is about forgiveness. A bible college teacher once told us about his struggle to forgive and how this verse helped him to come to grips with the power of forgiveness.. he realized that those he forgave were forgiven even though his feelings told him they were not. Many times I remember that when I forgive - feelings will eventually follow the act of forgiveness.
I am in awe of the resurrection Lord. It cause me to realize my need to forgive.