Then he said to Thomas, "Put your finger here, and see my hands; and put out your hand, and place it in my side. Do not disbelieve, but believe." Thomas answered him, "My Lord and my God!" Jesus said to him, "Have you believed because you have seen me? Blessed are those who have not seen and yet have believed." John 20:27-29 (ESV)
Somehow, even after Jesus had performed miracle after miracle and fulfilled every single Old Testament prophecy concerning himself, his disciples still struggled with disbelief. In particular, Thomas' response to the risen Christ made him the poster child for doubt, earning all skeptics who came after him the title of "Doubting Thomas."
It's easy to lose our faith when we experience deep hurt or loss. Whether we verbalize it or not, we may say with Thomas that we cannot and will not believe God is there unless he gives us a sign. In our pain, we believe we have earned the right to test him. But that attitude dismisses everything that has come before; all the many ways in which we have seen and known God's goodness to us. Thomas' ultimate confession of faith is genuine and moving, but Jesus gently reminds him and us that there is great blessing to be found in believing when we cannot see.