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"I affirm the reality of an economic science. This proposition, which few economists now dare to question, is the boldest, perhaps, that a philosopher ever maintained; and the inquiries to follow will prove, I hope, that its demonstration will one day be deemed the greatest effort of the human mind. I affirm, on the other hand, the absolute certainty as well as the progressive nature of economic science, of all the sciences in my opinion the most comprehensive, the purest, the best supported by facts: a new proposition, which alters this science into logic or metaphysics in concreto, and radically changes the basis of ancient philosophy. In other words, economic science is to me the objective form and realization of metaphysics; it is metaphysics in action, metaphysics projected on the vanishing plane of time; and whoever studies the laws of labor and exchange is truly and specially a metaphysician. The labor of man continues the work of God, who, in creating all beings, did but externally realize the eternal laws of reason. Economic science is, then, necessarily and at once a theory of ideas, a natural theology, and a psychology. This general outline alone would have sufficed to explain why, having to treat of economic matters, I was obliged previously to suppose the existence of God, and by what title I, a simple economist, aspire to solve the problem of certainty."