-St. Nikolai Velimirovic, "Homilies"
"The firmness of faith depends on God's grace. Who can comprehend the mysterious depths of God's providence? Who can say that God, in His providence, did not wish here to make use of Thomas' unbelief for the belief of many? In any case, two things have here been clearly shown: the terrible sickness of human nature, revealed in the stubborn unbelief of one of the apostles (who had innumerable reasons to believe), and God's most abundant wisdom and love. In His purity and holiness, God does not use evil that good may come, nor make use of evil means to achieve good ends, but, in His wisdom and His love for mankind, He corrects our evil ways and turns them to good."
-St. Nikolai Velimirovic, Homily: "The Gospel on the Apostle Thomas' Doubt and Faith"