Tertullian is commonly known as the earliest of the Latin fathers. [371:2] The writer who first attempted to supply the rulers of the world with a Christian literature in their own tongue encountered a task of much difficulty. It was no easy matter to conduct theological controversies in a language which was not remarkable for flexibility, and which had never before been employed in such discussions; and Tertullian seems to have often found it necessary to coin unwonted forms of expression, or rather to invent an ecclesiastical nomenclature. The ponderous Latin, hitherto accustomed to speak only of Jupiter and the gods, engages somewhat awkwardly in its new vocation; and yet contrives to proclaim, with wonderful power, the great thoughts for which it must now find utterance. Several years after his appearance as an author, Tertullian lapsed into Montanism--a species of heresy peculiarly attractive to a man of his rugged and austere character. Some of his works bear clear traces of this change of sentiment; but others furnish no internal evidences warranting us to pronounce decisively respecting the date of their composition. It is remarkable that though he identified himself with a party under the ban of ecclesiastical proscription, his works still continued to be held in high repute, and to be perused with avidity by those who valued themselves on their zeal for orthodoxy. It is recorded of one of the most influential of the Catholic bishops of the third century that he read a portion of them daily; and, when calling for his favourite author, he is reported to have said--"Give me _the Master_." [372:1] Tertullian flourished at a period when ecclesiastical usurpation was beginning to produce some of its bitter fruits, and when religion was rapidly degenerating from its primitive purity. [372:2] His works, which treat of a great variety of topics interesting to the Christian student, throw immense light on the state of the Church in his generation. His best known production is his _Apology_, in which he pleads the cause of the persecuted disciples with consummate talent, and urges upon the state the equity and the wisdom of toleration. He expounds the doctrine of the Trinity more lucidly than any preceding writer; he treats of Prayer, of Repentance, and of Baptism; he takes up the controversy with the Jews; [372:3] and he assails the Valentinians and other heretics. But the way of salvation by faith seems to have been very indistinctly apprehended by him, so that he cannot be safely trusted as a theologian. He had evidently no clear conception of the place which works ought to occupy according to the scheme of the gospel; and hence he sometimes speaks as if pardon could be purchased by penance, by fasting, or by martyrdom.