“The difference between believers and unbelievers as to knowledge, is not so much in the matter of their knowledge, as in the manner of knowing. Unbelievers some of them may know more, and be able to say more of God, his perfections and his will, than many believers, but they know nothing as they ought: nothing in a right manner, nothing spiritually and savingly; nothing with an holy, heavenly light. The excellency of a believer is not, that he hath a large apprehension of things, but that what he doth apprehend (which perhaps may be very little) he sees it in the light of the Spirit of God, in a saving soul-transforming light: And this is that which gives us communion with God, and not prying thoughts, or curious raised notions.”
– John Owen (1616-1683), Of the Mortification of Sin in Believers (3rd edition), p. 141-142
Theologia est doctrina Deo vivendi per Christum - Theology is the doctrine of living unto God through Christ 