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376 pages, Paperback
First published January 1, 1936
But the history of the idea of the Chain of Being — in so far as that idea presupposed such a complete rational intelligibility of the world — is the history of a failure; more precisely and more justly, it is the record of an experiment in thought carried on for many centuries by many great and lesser minds, which can now be seen to have had an instructive negative outcome. The experiment, taken as a whole, constitutes one of the most grandiose enterprises of the human intellect. But as the consequences of this most persistent and most comprehensive of hypotheses became more and more explicit, the more apparent became its difficulties; and when they are fully drawn out, they show the hypothesis of the absolute rationality of the cosmos to be unbelievable. It conflicts, in the first place, with one immense fact, besides many particular facts, in the natural order — the fact that existence as we experience it is temporal. A world of time and change — this, at least, our history has shown — is a world which can neither be deduced from nor reconciled with the postulate that existence is the expression and consequence of a system of ‘eternal’ and ‘necessary’ truths inherent in the very logic of being. Since such a system could manifest itself only in a static and constant world, and since empirical reality is not static and constant, the ‘image’ (as Plato called it) does not correspond with the supposed ‘model’ and cannot be explained by it. Any change whereby nature at one time contains other things or more things than it contains at another time is fatal to the principle of sufficient reason, in the sense which we have seen it to have had for those philosophers who understood it best and believed in it most devoutly. (pp. 329-330)
i) continuitatea diferitelor ordine de existenţă şi este o idee care apare în (neo)platonism, dar culminează în metafizica lui Leibniz. De altfel, Leibniz este primul gînditor care defineşte principiul continuităţii (care e un alt nume pentru principiul plenitudinii). Între specii nu există locuri goale, neocupate, vacante. Între regunul vegetal și cel animnal trebuie să existe o ființă care deține cîte ceva din amîndouă. Leibniz a identificat această ființă miraculoasă în așa-numitul „miel scitic”.
ii) În al doilea rînd - şi ca o consecinţă a acceptării continuităţii ordinelor realităţii -, filosoful care primeşte ideea de plenitudine trebuie să admită în acelaşi timp următorul principiu logic: orice este posibil tinde să se realizeze în timp; nu există posibil fără o împlinire (actualizare) a lui.