After leaving the university he was appointed vicar of Over-Whitacre, and rector of Sheldon in Warwickshire, where he wrote his famous Catechetical Lectures.
He founded institutions for rescuing fallen women, started orphanages and organized catechetical instructions..
Some of Cyril's personal preferences expressed in his catechetical lectures find expression, e.g.
In 1501 Bishop Luke of Prague edited the first Protestant hymn-book; in 1502 he issued a catechism, which circulated in Switzerland and Germany and fired the catechetical zeal of Luther; in 1565 John Blahoslaw translated the New Testament into Bohemian; in1579-1593the Old Testament was added; and the whole, known as the Kralitz Bible, is used in Bohemia still.
He first settled in Egypt, hearing the lectures of Didymus, the Origenistic head of the catechetical school at Alexandria, and also cultivating friendly relations with Macarius the elder and other ascetics in the desert.
He held monks strictly to the performance of their vows; took care to satisfy himself of the fitness of candidates for bishoprics; enjoined regular catechetical instruction, greater simplicity in preaching, and greater reverence in worship. The moral teaching of the Jesuits incurred his condemnation (1679) (see Liguori), an act which the society never forgave, and which it partially revenged by forcing, through the Inquisition, the condemnation of the quietistic doctrines of Molinos (1687), for which Innocent entertained some sympathy (see MoLINOs).
At a very early age, about the year 200, he listened to the lectures of Pantaenus and Clement in the catechetical school.
The Catechetical school was primarily meant for instructing adult inquirers into Christianity.
With the rise of theological controversy and the growth of heresy catechetical instruction became of vital importance to the Church, and much greater importance was attached to it.
There were two directions, however, in which this purpose was enlarged: (a) We have no reason to suppose that when infant baptism was introduced, those who had been baptized in infancy were excluded from the catechetical training, or that instruction was deemed unnecessary in their case, though as a matter of fact we have no definite reference to their admission.