[2] In his Essay in _Lux Mundi_ (1889). He has since developed his view in his Bampton Lectures on _The Incarnation of the Son of God_ and a volume of _Dissertations on Subjects connected with the Incarnation_. [3] I venture thus to translate 'Principium' (_arche_); in Abelard and his disciple Peter the Lombard, the famous Master of the Sentences, the word is 'Potentia' (L. I. Dist. xxxiv.): and St. Thomas himself (P. I. Q. xli. Art. 4) explains 'Principium' by 'Potentia generandi Filium.' [4] Thus in _Summa Theologica_, Pars I. Q. xxxvii. Art. 1, the 'conclusio' is 'Amor, personaliter acceptus, proprium nomen est Spiritus sancti,' which is explained to mean that there are in the Godhead 'duse processiones: Una per modum intellectus, quae est processio Verbi; alia per modum voluntatis, quae est processio amoris.' So again (_ibid._ Q. xlv. Art. 7): 'In creaturis igitur rationalibus, in quibus est intellectus et voluntas, invenitur repraesentatio Trinitatis per modum imaginis, inquantum invenitur in eis Verbum conceptum, et amor procedens.' In a friendly review of my Essay in _Contentio Veritatis_, in which I endeavoured to expound in a modern form this doctrine, Dr. Sanday (_Journal of Theological Studies_, vol. iv., 1903) wrote: 'One of the passages that seem to me most open to criticism is that on the doctrine of the Trinity (p. 48). "Power, Wisdom, and Will" surely cannot be a sound trichotomy as applied either to human nature or Divine. Surely Power is an expression of Will and not co-ordinate with it. The common division, Power (or Will), Wisdom, and Love is more to the point. Yet Dr. Rashdall identifies the two triads by what I must needs think a looseness of reasoning.' The Margaret Professor of Divinity hardly seems to recognize that he is criticizing the Angelical Doctor and not myself. If Dr. Sanday had had the formulation of the doctrine of the Trinity, the result, if less metaphysically subtle, might no doubt have proved more easily intelligible to the modern mind; but the 'identification' of which he complains happens to be part of the traditional doctrine, and I was endeavouring merely to make the best of it for modern Christians. I add St. Thomas' justification of it, which is substantially what I gave in _Contentio Veritatis_ and have repeated above: 'Cum processiones divinas secundum aliquas actiones necesse est accipere, secundum bonitatem, et hujusmodi alia attributa, non accipiuntur aliae processiones, nisi Verbi et amoris, secundum quod Deus suam essentiam, veritatem et bonitatem intelligit et amat' (Q. xxvii. Art. 5). The source of the doctrine is to be found in St. Augustine, who habitually speaks of the Holy Spirit as Amor; but, when he refers to the 'Imago Trinitatia' in man the Spirit is represented sometimes by 'Amor,' sometimes by 'Voluntas' (_de Trin._, L. xiv. cap 7). The other two members of the human triad are with him 'Memoria' (or 'Mens') and 'Intelligentia.'