Doctrine is not an affair of the tongue, but of the life.

Adrien Moreau. Contemplation on the Riverbank.

It 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.

Let them, therefore, either cease to insult God, by boasting that they are what they are not, or let them show themselves not unworthy disciples of their divine Master. 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. The Golden Booklet on the True Christian Life.