The soul must be immaterial since it has the power of cognizing the universal; and its immortality is further based by St Thomas on the natural longing for unending existence which belongs to a being whose thoughts are not confined to the " here " and " now," but are able to abstract from every limitation.
Darboy was the author of a number of works, of which the most important are a Vie de St Thomas Becket (1859), a translation of the works of St Denis the Areopagite, and a translation of the Imitation of Christ.
In the 18th century the manor passed by marriage to the Courtenays, afterwards earls of Devon, and Robert de Courtenay in 1220 gave the king a palfrey to hold an annual fair at his manor of Okehampton, on the vigil and feast day of St Thomas the Apostle.
For many years Peckham taught at Paris, coming into contact with the greatest scholars of the day, among others St Thomas Aquinas.
The famous quarrel with St Thomas of Cantilupe, bishop of Hereford, arose out of similar causes.