By the word _inspiration_, when used in a theological sense, we understand such an illumination and guidance of the Holy Spirit as raises a speaker or writer above error, and thus gives to his teachings a divine authority. If we attempt to investigate the interior nature of this superhuman influence, its different degrees and modes of operation, and the relation which the human mind holds to the divine in the case of those who receive it, we find ourselves involved in many difficulties, some of which at least are to our finite minds insuperable. But if we look at it from a practical point of view, restricting our inquiries to the _end_ proposed by God in inspiration, which is to furnish his church with an infallible and sufficient rule of faith and practice, we find no difficulty in understanding the subject so far as our duty and welfare are concerned. From such a practical position the question of inspiration will now be discussed; and the inquiry will be, at present, restricted to the writings of the New Testament. In connection with this discussion will also be considered the subject of the _canon_, not in its particular extent, but in the _principle_ upon which it is formed. 1. It is necessary, first of all, to find a sure _rule_ by which we can try the claims of a given book to be inspired, and consequently to be admitted into the canon of the New Testament. It cannot be simply the writer's own declaration. It will be shown hereafter that, in connection with other evidence, his testimony concerning himself is of the highest importance. But the point now is, that no man's inspiration is to be acknowledged simply on his own word. Nor can we decide simply from the contents of the book. Very important indeed is the question concerning the contents of any book which claims to be a revelation from God. Yet we cannot take the naked ground that a given book is inspired because its contents are of a given character. This would be virtually to set up our own reason as the supreme arbiter of divine truth, which is the very position of rationalism. Nor can we receive a book as inspired on the so-called authority of the church, whether this mean the authority of a man who claims to be its infallible head, or the authority of a general council of the churches. Admitting for a moment the Romish doctrine of the infallibility of the church, we could know this infallibility not from the declaration of any man or body of men in the church, but from Scripture alone. But this is assuming at the outset the infallibility of Scripture, and therefore its inspiration, which is the very point at issue. Looking at the question on all sides, we shall find for a given book of the New Testament no valid test of the writer's inspiration except _his relation to the Lord Jesus Christ_. This presupposes our Lord's divine mission and character, and his supreme authority in the church. It is necessary therefore to begin with the great central fact