Consequently, value appears successively under three aspects: useful value, exchangeable value, and synthetic, or social, value, which is true value. The first term gives birth to the second in contradiction to it, and the two together, absorbing each other in reciprocal penetration, produce the third: so that the contradiction or antagonism of ideas appears as the point of departure of all economic science, allowing us to say of it, parodying the sentence of Tertullian in relation to the Gospel, Credo quia absurdum: There is, in social economy, a latent truth wherever there is an apparent contradiction, Credo quia contrarium. From the point of view of political economy, then, social progress consists in a continuous solution of the problem of the constitution of values, or of the proportionality and solidarity of products. But while in Nature the synthesis of opposites is contemporary with their opposition, in society the antithetic elements seem to appear at long intervals, and to reach solution only`after long and tumultuous agitation. Thus there is no example--the idea even is inconceivable--of a valley without a hill, a left without a right, a north pole without a south pole, a stick with but one end, or two ends without a middle, etc. The human body, with its so perfectly antithetic dichotomy, is formed integrally at the very moment of conception; it refuses to be put together and arranged piece by piece, like the garment patterned after it which, later, is to cover it.[10] [10] A subtle philologist, M. Paul Ackermann, has shown, using the French language as an illustration, that, since every word in a language has its opposite, or, as the author calls it, its antonym, the entire vocabulary might be arranged in couples, forming a vast dualistic system. (See Dictionary of Antonyms. By Paul Ackermann. Paris: Brockhaus & Avenarius. 1842) In society, on the contrary, as well as in the mind, so far from the idea reaching its complete realization at a single bound, a sort of abyss separates, so to speak, the two antinomical positions, and even when these are recognized at last, we still do not see what the synthesis will be. The primitive concepts must be fertilized, so to speak, by burning controversy and passionate struggle; bloody battles will be the preliminaries of peace. At the present moment, Europe, weary of war and discussion, awaits a reconciling principle; and it is the vague perception of this situation which induces the Academy of Moral and Political Sciences to ask, "What are the general facts which govern the relations of profits to wages and determine their oscillations?" in other words, what are the most salient episodes and the most remarkable phases of the war between labor and capital?