O St. Thomas, the Apostle of India, Father of our faith, you spread the light of Christ in the hearts of the people of India. You humbly confessed “My Lord and My God” and sacrificed your life for love of him. We pray to you to strengthen us with love and faith in Jesus Christ so that we may dedicate ourselves totally to the cause of the kingdom of justice, peace and love. We pray that through your intercession we may be protected from all trials, dangers and temptations and be strengthened in the love of the Triune God, Father, Son and the Holy Spirit. Amen.
Taken from: http://lordcalls.com/prayers-to-saints/prayer-to-st-thomas-the-apostle