Few writers deserve their place in the library of Nicene and Post-Nicene Fathers more thoroughly than Hilary. He might be said to be the one Latin theologian before the age of St. Augustine and St. Leo. Tertullian had a still greater influence upon the writers who followed him. He came at a still more formative and critical time, and the vis vivida of his original and wayward genius has rarely been equalled. But the particular influence which Tertullian exerted in coining the terms and marking out the main lines of Latin theology came to him almost by accident. He was primarily a lawyer, and his special gift did not lie in the region of speculation. It is a strange fortune which gave to the language on which he set his stamp so great a control of the future. The influence of Hilary on the other hand is his by right. His intercourse with the East had a marked effect upon him. It quickened a natural bent for speculation unusual in the West. The reader will find in Mr. Watson’s Introduction a description and estimate of Hilary’s theology which is in my opinion at once accurate, candid and judicious. No attempt is made to gloss over the defects, especially in what we might call the more superficial exegesis of Hilary’s argument; but behind and beneath this we feel that we are in contact with a very powerful mind. We feel that we are in contact with a mind that has seized and holds fast the central truth of the Christian system, which at that particular crisis of the Church’s history was gravely imperiled. The nerve of all Hilary’s thinking lies in his belief, a belief to which he clung more tenaciously than to life itself, that Christ was the Son of God not in name and metaphor only, but in fullest and deepest reality. The great Athanasius himself has not given to this belief a more impressive or more weighty expression. And when like assaults come round, as they are constantly doing, in what is in many respects the inferior arena of our own day, it is both morally bracing and intellectually helpful to go back to these protagonists of the elder time.