(6) Explain the nontheist understanding of Leibniz's 'Principle of Plentitude' and how that enters into his thinking that the Identity of Indiscernibles is true.

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Ask a Philosopher · Accepted Answer

Hmmm, interesting topic. Here is my rather lengthy response: The nontheist understanding of Leibniz's 'Principle of Plentitude' invites us to ponder the depths of existence and the nature of reality itself. This principle posits that a world that contains all possible beings—real and conceivable—is the most fruitful and rich of all worlds, for in it lies the vast array of possibilities that could achieve various forms of existence. Now, one might reasonably ask, "What does this have to do with the Identity of Indiscernibles?" For even as we delight in the diversity of existence, we must recognize that if two entities were truly indiscernible in every way—sharing properties, characteristics, and states—then, according to Leibniz, they would fundamentally collapse into a singular entity. Thus, the principle posits that every single existent being must possess some distinguishing characteristic that sets it willingly apart, lest we fall into metaphysical chaos where distinction loses its meaning altogether. It is within this nontheistic framework that we find a fascinating interplay: existence is abundant and pluralistic, yet every being is marked by individuality, a unique essence that is harmoniously woven into the tapestry of the universe. This philosophical dance reveals that the very nature of existence, when viewed through a nontheistic lens, encourages us to seek understanding and affirm that what is possible must also be actualized in the grand scheme of reality. Therefore, in acknowledging that every being must harbor its distinct nature, we do not simply affirm the conundrum of existence, but celebrate it; thus, the Identity of Indiscernibles reveals a profound truth: that all beings, in their uniqueness, coalesce to form a multitude which bespoke of the infinite potential that reality offers. In this, we find not merely an abstract philosophical position, but a profound acknowledgment of the inherent worth of every individual existence within the cosmos, urging us to contemplate the implications of such plenitude on our very understanding of identity, essence, and difference.