As the eighteenth century advanced, the men of literature rose in importance, and, aware of their own increasing power in a society which was dependent on them for intellectual gratification, they supported each other in their claims to what began to be considered the dignity of a man of letters. This was soon carried into extremes, and assumed, even in the halls of their protectors, a fanatical violence of opinion, and a dogmatical mode of expression, which made the veteran Fontenelle declare himself terrified for the frightful degree of _certainty_ that folks met with every where in society. The truth is, that men of letters, being usually men of mere theory, have no opportunity of measuring the opinions which they have adopted upon hypothetical reasoning, by the standard of practical experiment. They feel their mental superiority to those whom they live with, and become habitual believers in, and assertors of, their own infallibility. If moderation, command of passions and of temper, be part of philosophy, we seldom find less philosophy actually displayed, than by a philosopher in defence of a favourite theory. Nor have we found that churchmen are so desirous of forming proselytes, or soldiers of extending conquests, as philosophers in making converts to their own opinions. In France they had discovered the command which they had acquired over the public mind, and united as they were--and more especially the Encyclopedists,[28]--they augmented and secured that impression, by never permitting the doctrines which they wished to propagate to die away upon the public ear. For this purpose, they took care these should be echoed, like thunder amongst hills, from a hundred different points, presented in a hundred new lights, illustrated by a hundred various methods, until the public could no longer help receiving that as undeniable which they heard from so many different quarters. They could also direct every weapon of satirical hostility against those who ventured to combat their doctrines, and as their wrath was neither easily endured nor pacified, they drove from the field most of those authors, who, in opposition to their opinions, might have exerted themselves as champions of the Church and Monarchy.