Doctrine is not merely an affair of the tongue, but of the life; is not apprehended by the intellect and memory merely, like other branches of learning; but is received only when it possesses the whole soul, and finds its seat and habitation in the inmost recesses of the heart…. To doctrine in which our religion is contained we have given the first place, since by it our salvation commences; but it must be transfused into the breast, and pass into the conduct, and so transform us into itself, as not to prove unfruitful.

—John Calvin, Institutes of the Christian Religion, III:6.4.