The distinction pointed out by Lewes between Locke and Hobbes and Gassendi, is that the two latter taught that all our ideas were derived from sensations, while Locke said there were two sources, not one source, and these two were sensation and reflection. Locke was in style a more popular writer than Hobbes, and the heretical effect of the doctrines on the mind not being so immediately perceived in consequence of Locke's repeated declarations in favour of Christianity, his metaphysical productions were more widely read than those of Hobbes; but Locke really teaches the same doctrine as that laid down by Robert Owen in his views on the formation of character; and his views on sensation, as the primary source of ideas, are fatal to all notions of innate ideas and of freewill. Voltaire, speaking of Locke, says:--"'We shall, perhaps, never be capable of knowing whether a being purely material thinks or not.' This judicious and guarded observation was considered by more than one divine, as neither more nor less than a scandalous and impious declaration, that the soul is material and mortal. Some English devotees, after their usual manner, sounded the alarm. The superstitious are in society what poltroons are in an army--they both feel and excite causeless terror. The cry was, that Mr. Locke wished to overturn religion; the subject, however, had nothing to do with religion at all; it was purely a philosophical question, and perfectly independent of faith and revelation." One clergyman, the Rev. William Carrol, wrote, charging Atheism as the result of Locke's teachings. The famous Sir Isaac Newton even grew so alarmed with the materialistic tendency of Locke's philosophy, that when John Locke was reported sick and unlikely to live, it is credibly stated that Newton went so far as to say that it would be well if the author of the essay on the Understanding were already dead. In 1689, one Cassimer Leszynski, a Polish knight, was burned at Warsaw for denying the being and providence of a God; but there are no easy means of learning whether the charge arose from prejudice on the part of his accusers, or whether this unfortunate gentleman really held Atheistic views.