'If a man is able to predict with nearly perfect confidence, phenomena with whose laws he is acquainted; if, even when they are unknown to him, he is able, in accordance with the experience of the past, to foresee with a large degree of probability the events of the future, why should we treat it as a chimerical enterprise, to trace with some verisimilitude the picture of the future destinies of the human race in accordance with the results of its history? The only foundation of belief in the natural sciences is this idea, that the general laws, known or unknown, which regulate the phenomena of the universe are necessary and constant; and why should this principle be less true for the development of the moral and intellectual faculties of man than for other natural operations? In short, opinions grounded on past experience in objects of the same order being the single rule of conduct for even the wisest men, why should the philosopher be forbidden to rest his conjectures on the same base, provided that he never attributes to them a degree of certainty beyond what is warranted by the number, the constancy, and the accuracy of his observations?'[57] Thus Condorcet's purpose was not to justify nature, as it had been with Kant, but to search in the past for rational grounds of a belief in the unbounded splendour of men's future destinies. His view of the character of the relations among the circumstances of the social union, either at a given moment or in a succession of periods, was both accurate and far-sighted. When he came actually to execute his own great idea, and to specify the manner in which those relations arose and operated, he instantly diverged from the right path. Progress in his mind is exclusively produced by improvement in intelligence. It is the necessary result of man's activity in the face of that disproportion ever existing between what he knows and what he desires and feels the necessity to know.[58] Hence the most fatal of the errors of Condorcet's sketch. He measures only the contributions made by nations and eras to what we know; leaving out of sight their failures and successes in the elevation of moral standards and ideals, and in the purification of human passions.