We must strive onward by this straight path if we seriously aspire to the pure contemplation of God. We must come, I say, to the Word, where God is truly and vividly described to us from his works, while these very works are appraised not by our depraved judgment but by the rule of eternal truth. If we turn aside from the Word, as I have just now said, though we may strive with strenuous haste, yet, since we have got off the track, we shall never reach the goal. For we should so reason that the splendor of the divine countenance, which even the apostle calls “unapproachable” [1 Tim. 6:16], is for us like an inexplicable labyrinth unless we are conducted into it by the thread of the Word; so that it is better to limp along this path than to dash with all speed outside it.
Institutes of the Christian Religion, Volumes 1 & 2, ed. John T. McNeill, trans. Ford Lewis Battles, The Library of Christian Classics (Louisville, KY: Westminster John Knox Press, 2011) Vol. 1.6.3. p. 72-73.