The ‘Rational Theology’ of Sabunde is indeed a most noteworthy book; full of true piety, resting on the wider and surer grounds of nature at large in harmony with human intelligence, than the dogmatic theologian can show in the written text and unwritten traditions on which he relies for his conclusions. Containing no word that is not thoroughly orthodox, doctrine, nevertheless, is not that which it is the grand object of the ‘Rational Theology’ of Sabunde to propound. Neither is authority paraded, as it would have been had the book been written by a professed theologian, instead of a pious naturalist; for Sabunde was a physician, one of the guild whose destiny it is to lead the van of progress. We cannot believe that the work, though often reprinted, was ever heartily approved by the heads of the Church of Rome. Its title went far to condemn it. The Roman Catholic Church requires faith, submissiveness, subserviency, not reason, of its sons; and we are not, therefore, surprised to find that though the ‘Rational Theology’ of Sabunde, as a whole, long escaped being placed on the index of prohibited books, the prologue with which we find one of the early editions, if it be not the first (Argentorati, 1496), introduced, was soon ordered to be expunged; nor, indeed, as culture extended and the Reformation spread, with ever-increasing alarm to the dominant Church, that the book itself was at length pointedly forbidden to be read by the faithful. It was put upon the ‘Index’ by the Congregation of the Council of Trent in 1595, the author ‘holding too much by Nature,’ say the reverend councillors, ‘to give us a knowledge of God and his providential dealing with the world, and making too little reference to the Fathers and the authority of Holy Writ.’