Jesus asks the man to do what had seemed impossible a moment before. At His command, the man places himself in full view of the synagogue's audience so that everyone present can witness it, and without even touching him, Jesus immediately heals him. When the man stretches out his hand for all to see, the crowd witnesses positive proof of Christ's power and holiness.
Despite the shame of his withered hand, the man still attends Sabbath services at the synagogue. He places a higher priority on worshipping God than on his personal discomfort. The principle illustrated here is that people should not use physical problems as an excuse for not going to church. A person should attend services when able.
The downside of missing services is that, eventually, spiritual problems with far more serious consequences will develop. No one can do much in service to God if he allows physical problems or handicaps to impede his worship and service of his Creator. In a sense, many of us suffer from withered hands. Sin so paralyzes us that we cannot serve God as we would like. Yet, anyone in God's church can be empowered to do the needed things for our Healer.
The real issue is faith. Jesus fulfills God's intention for the Sabbath day by restoring this man to health and strength. In answering Christ's call to step forward, the man shows what a little faith and obedience can do. This tests his courage and faith as he rises above his human fears. He entirely trusts Christ, and his healing is God's response.
Martin G. Collins
The Miracles of Jesus Christ: Healing a Withered Hand (Part Two)