Those who are familiar with St. Thomas’s Proemium to his Summa contra Gentiles will recall his words on the meaning of true Wisdom. ‘Sapientis est ordinare,’ he says, ‘it is a wise man’s business to deal with things in orderly fashion, and since the goal or end we have in view must govern our procedure, and since the supreme goal for us all must be the Divine Truth, the study of it should be the one preoccupation of the wise man.’ That is Theology, or the study of God. Now God is made known to us in nature, and the true scientist is he who endeavours to arrive at a knowledge of the Creator through His creation. But besides the Book of Nature there is also the Book wherein God has spoken to us and shewn us the path to heaven, in which He has ‘set before us life and death.’ This is His Revelation, the theologian’s quarry, the true source of his wisdom. Hence the words above quoted from Job are with peculiar appositeness used by the Church in the Breviary Office for the Feast of St. Jerome, the ‘Doctor maximus’ whose entire life was spent in toiling in that quarry.