Having joined the Tractarian Movement, in 1839 Morris was briefly left to deputize for John Henry Newman at St Mary's, Oxford, the university church: he alarmed his audience with a sermon on angels and fasting, "declaring inter alia that the brute creation should be made to fast on fast days".
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After his ordination (deacon 1833 and priest 1834), he held several university and college offices, and in 1843 succeeded John Henry Newman as vicar of the University Church of St Mary the Virgin.
His Laudian views and the construction of the baroque south porch of St. Mary's University Church in Oxford (together with a statue of the Virgin and Child) precipitated his overthrow.