Go, therefore, and make disciples of all nations,
baptizing them in the name of the Father, and of the Son, and of the Holy Spirit,
teaching them to observe all that I have commanded you.
And behold, I am with you always, until the end of the age.
— Matthew 28:19-20
“The [Rite of Christian Initiation of Adults] is a pastoral plan and ritual process for the way the Church welcomes and forms adults and children of catechetical age in the way of Jesus as it is lived in the Roman Catholic tradition” (Ronald J. Lewinski, An Introduction to the RCIA: The Vision of Christian Initiation, [Liturgy Training Publications: Chicago], vi).