The Rise and Triumph of the Modern Self by Carl Trueman
Confirmation, a sacrament in Roman Catholic theology, was an offence to Calvin because it sapped the meaning of baptism. In scholastic terms, baptism only washed away original sin and those sins committed before baptism. Confirmation was viewed as a sacrament of continuing grace. Calvin, on the other hands, viewed baptism and a sign and seal of forgiveness and reconciliation for the entirety of one's life - making confirmation unnecessary.
More on sacraments - additional ones invented by men. Using the formula that sacraments are "visible signs of an invisible grace" Calvin notes that there is no limit to the inventions that can pass this test. Reverting again to the argument of recent novelty, Calvin argues that the seven sacraments of medieval Catholicism were unknown in the early church. They are a recent invention (addition) and fail for that reason. Sola Scriptura must be the basis on which sacraments are judged. How many sacraments did Jesus give to the church? Two and only two: baptism and the Lord's Supper.
You can read the text of his prayer below:
Wang Mingdao – Against the Christless Christianity of the Authorized Church
Onesimos Nesib, Aster Ganno, and the Oromo Translating Team
Onesimos Nesib’s Conversion