Oh, what mad, senseless fools are we that, while we must ever live and dwell among such mighty enemies as the devils are, we nevertheless despise our weapons and defense, and are too lazy to look at or think of them! And what else are such supercilious, presumptuous saints, who are unwilling to read and study the Catechism daily, doing than esteeming themselves much more learned than God Himself with all His saints, angels [patriarchs], prophets, apostles, and all Christians For inasmuch as God Himself is not ashamed to teach these things daily, as knowing nothing better to teach, and always keeps teaching the same thing, and does not take up anything new or different, and all the saints know nothing better or different to learn, and cannot finish learning this, are we not the finest of all fellows to imagine, if we have once read or heard it, that we know it all, and have no further need to read and learn, but can finish learning in one hour what God Himself cannot finish teaching, although He is engaged in teaching it from the beginning to the end of the world, and all prophets, together with all saints, have been occupied with learning it and have ever remained pupils, and must continue to be such ? For it needs must be that whoever knows the Ten Commandments perfectly must know all the Scriptures, so that, in all affairs and cases, he can advise, help, comfort, judge, and decide both spiritual and temporal matters and is qualified to sit in judgment upon all doctrines, estates, spirits, laws, and whatever else is in the world. And what, indeed, is the entire Psalter but thoughts and exercises upon the First Commandment? Now I know of a truth that such lazy paunches and presumptuous spirits do not understand a single psalm, much less the entire Holy Scriptures; and yet they pretend to know and despise the Catechism, which is a compend and brief summary of all the Holy Scriptures. Therefore I again implore all Christians, especially pastors and preachers, not to be doctors too soon, and imagine that they know everything (for imagination and cloth unshrunk [and false weights] fall far short of the measure), but that they daily exercise themselves well in these studies and constantly treat them; moreover, that they guard with all care and diligence against the poisonous infection of such security and vain imagination, but steadily keep on reading, teaching, learning, pondering, and meditating, and do not cease until they have made a test and are sure that they have taught the devil to death and have become more learned than God Himself and all His saints.