Thomas was so close. His sainthood teetered on the edge. If our Lord had not been merciful and returned to show his wounds, Thomas might never have believed in the Resurrection and might not have remained a follower of Christ. He would not be a saint and would be grouped instead with Judas. Thomas was so close to forsakenness. He could have fallen away. But Jesus catered to Thomas' need for proof and kept him secure. “Then he said to Thomas, ‘Put your finger here and see my hands, and bring your hand and put it into my side, and do not be unbelieving, but believe.’ Thomas answered and said to him, ‘My Lord and my God!’“ (Jn 20:27-28).
Maybe you've been close to the edge, close to falling astray and away from Christ. Or maybe even you did fall and were away for a while. Thomas is your saint then.