Tradition
St. Cyril of Jerusalem
Catechetical Lectures
Book 23 › Section 1
1. By the loving-kindness of God you have heard sufficiently at our former meetings concerning Baptism, and Chrism, and partaking of the Body and Blood of Christ; and now it is necessary to pass on to what is next in order, meaning today to set the crown on the spiritual building of your edification.
Source: Catechetical Lectures (New Advent)