I believe that I am and always will be a member of this church or people of God (John 10:28,29), since I believe in Christ, have been baptized into His name, and trust the promise, “Whoever believes and is baptized will be saved” [Mark 16:16]. I believe and am baptized; therefore I shall be saved. That is the only way, for Christ promised it.
~ Caspar Olevianus A Firm Foundation: An Aid to Interpreting the Heidelberg Catechism pg. 96 Lord’s Day 21 Q132
