This is the final part of Canon Ward's 2009 Assumptiontide Lecture at the Shrine of Our Lady of Walsingham:
Eadmer in his first treatise On the Excellence of the Virgin Mary remains close to the doctrine of his mentor: not yet able to account for an immaculist position in terms which did justice to the strict necessity for the Incarnation, he is satisfied with the Anselmian precept that the Virgin should shine with a purity which was only exceeded by God’s own. However, by the time he comes to write specifically about the conception of the Virgin in the 1120s, he is determined to press the argument from congruity beyond Anselm’s argument for a purification of Mary by divine action in the womb to a full exemption from original sin. In doing so he employs the striking and somewhat esoteric analogy of the chestnut: just as the chestnut is conceived and grown amid spines which do it no harm, so God is able in preparing a temple for his dwelling to ensure that though this body be conceived among the spines of sin, it would be completely unharmed by their sharp points. Eadmer concludes by stating of God: Potuit plane et voluit; si igitur voluit, fecit [Eadmer of Canterbury, Tractatus de conceptione Sanctae Mariae, PL 159, cc. 305-6], a remarkable anticipation by two centuries of the Scotist formula Potuit, decuit, ergo fecit. It was this treatise which when ascribed by mistake to Anselm enjoyed a wide and authoritative circulation during the immaculist debates of the high middle ages, and was prescribed in portions under Anselm’s name for liturgical recitation by the Council of Basle when it made observance of the feast of the Virgin’s conception mandatory in 1438 [Southern, Anselm, p. 436]. Eadmer with great intellectual acumen chose to defend the inchoate Marian instinct of his nation with the subtle dialectic of the new theology, and was amply rewarded for his ingenuity.
Anselm is no Bernard as a Marian theologian: in his character as a monk he was content to work within the customary strictures and restraints of the Benedictine life he had weighed gravely as his vocation as a young man and then accepted under the measured tutelage of Herluin the founder of Bec, and Lanfranc his intellectual mentor. Because he instigated no reform of the religious life as a counterpoint to the novel sensibility of his affective devotion, Anselm neither sought nor achieved the dissemination of his own religious ethos which Bernard inspired with the Cistercian movement. His influence was confined to a small circle of admiring disciples: his fellow monks at Bec and