Roman Catechism 4.28

Chapter 4 — Part I: The Creed — Article II: And in Jesus Christ, His Only Son, Our Lord

Section 28. This indeed, we promised at the doors of the church when about to be baptised; for we then declared that we renounced the devil and the world, and gave ourselves unreservedly to Jesus Christ. But if to be enrolled as soldiers of Christ we consecrated ourselves by so holy and solemn a profession to our Lord, what punishments should we not deserve if after our entrance into the Church, and after having known the will and laws of God and received the grace of the Sacraments, we were to form our lives upon the precepts and maxims of the world and the devil, just as though when cleansed in the waters of Baptism, we had pledged our fidelity to the world and to the devil, and not to Christ the Lord and Saviour!