Being desirous to improve the condition of the industrial classes, Owen speculated on the causes of evil; and, approaching the subject from the extreme sensational point of view, regarded the power of circumstances to be so great, that he was led to regard action as the obedience to the strongest motive. He thus introduced the idea of physical causation into the human will; and made the rule of right to be each one’s own pleasures and pains. Founding political inferences on this ethical theory of circumstantial fatalism, he proposed the system called socialism, which aimed at modifying temptations and removing two great classes of temptations, by facilitating divorce, and proposing equality of property. The system is now obsolete both in idea and in history, yet it has an interest from the circumstance that until recently it deceived the minds and corrupted the religious faith of many of the manufacturing population. The history of the influence of French infidelity on the course of English thought closes with names of greater note.(640) If Owen, though belonging to the present century, represents the political tone of the past, we must also refer to the same period, morally though not chronologically, the spirit of unbelief which animated literature in the poetry of Byron and Shelley. Saddened by blighted hopes, political and personal, Byron affords a type of the unbelief which is marked by despair.(641) If compared with the two exiles of the Leman lake, whom the sympathy of a common scepticism and common exile commended to his meditation, he stands in many respects widely contrasted with them in tone and spirit. Allied rather to Gibbon in seriousness, he nevertheless wholly lacked his moral purpose and resolute spirit of perseverance. More nearly resembling Voltaire in the nature of his unbelief, he nevertheless differed in the features of gloom by which his mind was characterized. His unbelief was a remnant of the philosophic atheism of France; but it received a tinge in passing through the wounded mind of the poet. His brother poet, of a still loftier genius, is more widely contrasted with him in mental qualities, than united by similarity in the character of his unbelief. Both were weary of the world; but the one was drawn down by unbelief to earth, the other soared into the ideal: the one was driven to the gloom of despair, the other was excited by the imagination to the madness of enthusiasm: the one was made sad by disappointment, the other was goaded by it into frenzy. Shelley merits more than a passing notice, both because his poetry is a proof of our main position concerning the influence of certain forms of philosophy in producing unbelief, and because his mental history, as learned by means of his works and memoirs, is a psychological study of the highest value. The infidelity which shows itself in him is an _idolum specûs_, as well as an _idolum theatri_.(642)