He returned to Paris and began his lecturing on Science. His arguments had convinced one person at least, and that was himself, that as the Church knew nothing of Physical Science, why, possibly it stood in a like position regarding spiritual truth. That is to say, the so-called "sacred truths" were mere assumptions piled up to satisfy the people, and the ignorance and superstition of the many marked high water for the teaching of the priests. The business of the Church was to satisfy the people, and not enlighten them, for if the people became enlightened enough they would see that they did not need the Church, and then where were the honors and the riches and the red hats! Bruno cleared his mind of its cobwebs by expression, just as we all do--that is what expression is for. The people really dictate to the priests what they shall teach; moreover, the people absolutely refuse to listen to anything in which they do not believe, and decline to pay for preaching that is not done to their own dictation. The business, then, of the Church is to study carefully the ignorance of the people and conform to it. On this one thing does its stability depend. Therefore it must, as a matter of self-preservation, suppress any chance intellect that is ahead of its time, lest this man honeycomb the whole structure of churchly dogma. Bruno said that, just as the world seemed to stand still and the stars move around us, so did the Church seem to most people a fixed fact. But exactly the opposite was true; the Church moves as the people move, and unless men outside of the Church educate the people, or the people educate themselves, they will forever remain in darkness. Bruno offered to debate the question publicly with the Bishop of Paris. That worthy was no match for Bruno in point of oratory, but when we can not answer a man's reasons, all is not lost, for we can at least call him vile names, and this is often quite as effectual as logic. The Bishop launched a fusillade of theological lyddite at Bruno, declaring that any Churchman who would so much as hold converse with such a wretch was disgraced forever, and that the propositions Bruno wished to argue were unthinkable to a self-respecting man. He declared that it was only the mercy of God that kept the lightning from striking Bruno dead as he wrote his heresies. Matters were getting strained, and the authorities, fearing insurrection, acted upon the advice of the good Bishop and expelled Bruno from France. He went to Wittenberg, in his innocence, intending to tack on the church-door there his theses. But Wittenberg had no use for Bruno--he believed too much, or too little, Luther could not tell which.