Alexander was the number 1 to write a comment on the Sentences of Peter Lombard, before him theologiser experienced universally commented upon a scriptures. His Summa universae theologiae (foremost printed at Venice, 1475) was undertaken at the asking of Pope Innocent IV, and received his approbation. It was finished by Alexander's scholars when his dying. These are an independent act returning a triple series of authorities-- people world health organization say yes, people world health organization say there is no, then the reconciliation or even judgment. A authorities come chosen non single from either a Bible & the Fathers, however likewise among Greek, Latin, & Arabic poets & philosophers, and late theologiser. It treats around its number one a share a doctrines of God and his attributes; in its 2nd, people of Creation and sin; in its third, victims of redemption and atonement; &, around its for and survive, victims of the sacraments. Within recognition of his efforts, Alexander was given a title of "Doctor Irrefragabilis".

Among a school of thought which were specially developed &, thus to speak, fixed by Alexander of Hales, come people of the thesaurus supererogationis perfectorum, and of the character indelibilis of baptism, confirmation, and ordination. That philosophy experienced been written all about tremendously earliest by Augustine of Hippo and was eventually defined the dogma by the Council of Trent.

John Gerson tells the states “The doctrine of Alexander is of the wealth surpassing completely expression. These are said that somebody asked St. Thomas what was a better manner of researching theology; he replied that it was by attaching oneself to an expert. & to which Doctor? he was asked once more. To Alexander of Hales, a Angelic Doctor replied." (Gerson, Opera omnia.Epistola Lugdunum missa cuidam fratri Minori, vol. 1, p. 554.)

Compare Hailes Abbey, Gloucestershire, founded in 1245/6.