The amount of thought contributed by him to deism was small; for his influence on his successors was unimportant. The religious instincts of the heart were too strong to be permanently influenced by the cold materialist tone which reduced religion to state craft. With the exception of Coward,(378) a materialist who doubted immortality about the end of the century, the succeeding deists more generally followed Herbert, in wishing to elevate religion to a spiritual sphere, than Hobbes, who degraded it to political expedience. A slight additional interest however belongs to his speculations, from the circumstance that his ideas, together with those of Herbert, most probably suggested some parts of the system of Spinoza.(379) The two writers of whom we have now been treating, lived prior to or during the Commonwealth. From the date of the Restoration the existence of doubt may be accepted as an established fact. During the reaction, political and ecclesiastical, which ensued in the early part of the reign of Charles II, it is not surprising that doubt concealed itself in retirement; but the frequent allusions to it under the name of atheism,(380) in contemporary sermons and theological books, proves its existence. Indeed the reaction contained the very elements which were likely to foster unbelief among undiscerning minds. The court set a sad example of impurity; and the excessive claims of the churchmen, alien to the spirit of political and religious liberty, were calculated to generate an antipathy to the clergy and to religion.