Upon every subject that came within the sweep of his system, except mathematics and physics, his thoughts have been productive of thought. When the first storm of opposition from smaller men had begun to die down, thinkers of real weight, beginning with Cumberland and Cudworth, were moved by their aversion to his analysis of the moral nature of man to probe anew the question of the natural springs and the rational grounds of human action; and thus it may be said that Hobbes gave the first impulse to the whole of that movement of ethical speculation that, in modern times, has been carried on with such remarkable continuity in England. In politics the revulsion from his particular conclusions did not prevent the more clear-sighted of his opponents from recognizing the force of his supreme demonstration of the practical irresponsibility of the sovereign power, wherever seated, in the state; and, when in a later age the foundations of a positive theory of legislation were laid in England, the school of Bentham--James Mill, Grote, Molesworth--brought again into general notice the writings of the great publicist of the 17th century, who, however he might, by the force of temperament, himself prefer the rule of one, based his whole political system upon a rational regard to the common weal. Finally, the psychology of Hobbes, though too undeveloped to guide the thoughts or even perhaps arrest the attention of Locke, when essaying the scientific analysis of knowledge, came in course of time (chiefly through James Mill) to be connected with the theory of associationism developed from within the school of Locke, in different ways, by Hartley and Hume; nor is it surprising that the later associationists, finding their principle more distinctly formulated in the earlier thinker, should sometimes have been betrayed into affiliating themselves to Hobbes rather than to Locke. For his ethical theories see Ethics.