Thomas Waleys was a Dominican master of theology at Oxford University who delivered a sermon on the Beatific Vision in 1333. The sermon brought him into conflict with ecclesiastical authorities in Avignon. His idea that saints and purified souls would see God immediately after death was at odds with the position of Pope John XXII, who contended that God's essence would be revealed only after the Last Judgment.
In the first half of the 14th century Waleys wrote a tract which differentiated sermon style between the ancient manner of preaching and a newer style. The old manner employed by the Church Fathers and the saints was still preached in Italy and some other places. The modern sermon, however, was more commonly heard. The modus antiquus was made up of a verse-by-verse commentary on the Gospel reading of the day while the modern sermon had its foundation on an individual selected thema.
- De divinis moribus. Cologne, 1472 digital
- Dominican Education Before 1350, Marian Michelle Mulchahey, Political Institute of Medieval Studies, 1998, pg. 401.
- Censure and Heresy at the University of Paris, 1200 - 1400, J.M.M.H. Thijssen, University of Pennsylvania Press, 1998, pp. 13 - 14.
- History of Universities (Volume 2), Charles Schmitt, Avebury Publications, 1982, pg. 78.