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Augustin calls diligens negligentia was the best diligence as to that; while I was yet a very young man I had learned out of him that it was no solecism in a preacher to use ossum for os, for (saith he) an iron key is better than one made of gold if it will better open the door, for that is all the use of the key.
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Augustine of Hippo (The Complete Works of Saint Augustine: The Confessions, On Grace and Free Will, The City of God, On Christian Doctrine, Expositions on the Book Of Psalms, ... (50 Books With Active Table of Contents))