[I]n addition to the proper doctrine of faith and repentance in which Christ is set forth as a Mediator, the Scriptures employ certain marks and tokens to distinguish the only wise and true God, considered as the Creator and Governor of the world, and thereby guard against his being confounded with the herd of false deities.
[W]hile it becomes man seriously to employ his eyes in considering the works of God, [. . .] his special duty is to give ear to the Word, that he may the better profit. Hence it is not strange that those who are born in darkness become more and more hardened in their stupidity; because the vast majority instead of confining themselves within due bounds by listening with docility to the Word, exult in their own vanity.
If true religion is to beam upon us . . . it is necessary to begin with heavenly teaching. [I]t is impossible for any man to obtain even the minutest portion of right and sound doctrine without being a disciple of Scripture. Hence, the first step in true knowledge is taken, when we reverently embrace the testimony which God has been pleased therein to give of himself. For not only does faith, full and perfect faith, but all correct knowledge of God, originate in obedience. And surely in this respect God has with singular Providence provided for mankind in all ages.
For if we reflect how prone the human mind is to lapse into forgetfulness of God, how readily inclined to every kind of error, how bent every now and then on devising new and fictitious religions, it will be easy to understand how necessary it was to make such a depository of doctrine as would secure it from either perishing by the neglect, vanishing away amid the errors, or being corrupted by the presumptuous audacity of men.
It being thus manifest that God [. . .] has given the assistance of his Word to all whom he has ever been pleased to instruct effectually, we, too, must pursue this straight path, if we aspire in earnest to a genuine contemplation of God;—we must go, I say, to the Word, where the character of God, drawn from his works is described accurately and to the life; these works being estimated, not by our depraved Judgment, but by the standard of eternal truth.
If [. . .] we turn aside from it, how great soever the speed with which we move, we shall never reach the goal, because we are off the course.
We should consider that the brightness of the Divine countenance [. . .] is a kind of labyrinth,—a labyrinth to us inextricable, if the Word do not serve us as a thread to guide our path; and that it is better to limp in the way, than run with the greatest swiftness out of it. Hence the Psalmist [. . .] introduces God as reigning; meaning by the term, not the power which he possesses and which he exerts in the government of universal nature, but the doctrine by which he maintains his due supremacy: because error never can be eradicated from the heart of man until the true knowledge of God has been implanted in it.
John Calvin, The Institutes of the Christian Religion, 1.6.2-3