A philosophy can and must be worked out with the greatest rigour and discipline in the details, but can ultimately be founded on nothing but faith: and this is the reason, I suspect, why the novelties in philosophy are only in elaboration, and never in fundamentals.
The purpose of a Christian education would not be merely to make men and women pious Christians: a system which aimed too rigidly at this end alone would become only obscurantist. A Christian education must primarily teach people to be able to think in Christian categories.