The faith of Thomas is full of significance. First, it is helpful to our own faith to hear so decisive and so full a confession coming from the lips of such a man. John himself felt it to be so decisive that after recording it he virtually closes the Gospel which he had undertaken to write in order to persuade men that Jesus is the Son of God. After this confession of Thomas he feels that no more can be said. He stops not for want of matter; “many other signs truly did Jesus in the presence of His disciples” which are not written in this Gospel. These seemed sufficient. The man who is not moved by this will not be moved by any further proof. Proof is not what such a doubter needs. Whatever we think of the other Apostles, it is plain that Thomas at least was not credulous. If Peter’s generous ardour carried him to a confession unwarranted by the facts, if John saw in Jesus the reflection of his own contemplative and loving nature, what are we to say of the faith of Thomas? He had no determination to see only what he desired, no readiness to accept baseless evidence and irresponsible testimony. He knew the critical nature of the situation, the unique importance of the matter presented to his faith. With him there was no frivolous or thoughtless underrating of difficulties. He did not absolutely deny the possibility of Christ’s resurrection, but he went very near doing so, and showed that practically he considered it either impossible or unlikely in the extreme. But in the end he believes. And the ease with which he passes from doubt to faith proves his honesty and sound-heartedness. As soon as evidence which to him is convincing is produced, he proclaims his faith.

His confession, too, is fuller than that of the other disciples. The week of painful questioning had brought clearly before his mind the whole significance of the Resurrection, so that he does not hesitate to own Jesus as his God. When a man of profound spiritual feeling and of good understanding has doubts and hesitations from the very intensity and subtlety of his scrutiny of what appears to him of transcendent importance; when he sees difficulties unseen by men who are too little interested in the matter to recognise them even though they stare them in the face,—when such a man, with the care and anxiety that befit the subject, considers for himself the claims of Christ, and as the result yields himself to the Lord, he sees more in Christ than other men do, and is likely to be steadier in his allegiance than if he had slurred over apparent obstacles instead of removing them, and stifled objections in place of answering them. It was not the mere seeing of Christ risen which prompted the full confession of Thomas. But slowly during that week of suspense he had been taking in the full significance of the Resurrection, coming at the close of such a life as he knew the Lord had lived. The very idea that such a thing was believed by the rest forced his mind back upon the exceptional character of Jesus, His wonderful works, the intimations He had given of His connection with God. The sight of Him risen came as the keystone of the arch, which being wanting all had fallen to the ground, but being inserted clenched the whole, and could now bear any weight. The truths about His person which Thomas had begun to explain away return upon his mind with resistless force, and each in clear, certain verity. He saw now that his Lord had performed all His word, had proved Himself supreme over all that affected men. He saw Him after passing through unknown conflict with principalities and powers come to resume fellowship with sinful men, standing with all things under His feet, yet giving His hand to the weak disciple to make him partake in His triumph.

The Expositor's Bible: The Gospel of St John, Vol. II — Part 187