Philosophers have long asked why anything exists at all. Some argue, following Carl Hempel, that any explanation would depend on what it seeks to explain.
In 1714, the German polymath Gottfried Wilhelm Leibniz posed a question that has refused to loosen its grip on philosophy: why does anything exist at all? The query can sound almost childish until you sit with it. The sheer presence of a world—objects, people, galaxies, laws of nature—can suddenly feel less like a background assumption and more like an unresolved shock.
That sense of astonishment has a long pedigree. In Tractatus Logico-Philosophicus (1921), Ludwig Wittgenstein argued that the truly “mystical” feature of reality is not the particular way the world is arranged, but the fact that it exists in the first place. Arthur Schopenhauer, writing in 1818, described the issue as a perpetually unsettling riddle. Even far older sources gesture at the same vertigo: the Rigveda, among humanity’s earliest surviving religious texts, suggests that perhaps even a cosmic “overseer” might not know how existence began. Across centuries and traditions, the same basic intuition returns—existence looks, on reflection, improbable or at least deeply puzzling.
Yet despite sustained attention, philosophers have not converged on a single solution. Some go further and argue that the question may be unanswerable in principle. A notable case comes from the German philosopher Carl Hempel, writing in 1973. Hempel’s worry starts from a simple constraint on explanation: if you are trying to explain why penguins exist, you cannot use a particular penguin as the ultimate explanatory basis, because that penguin is part of what you are trying to account for. Extend the point to its limit, Hempel argues, and it seems to block any explanation of why anything whatsoever exists. Any proposed answer that cites an existing entity—God, laws of physics, a quantum vacuum, a multiverse—appears to smuggle in the very thing it must explain. And Hempel doubts there is any other kind of explanation available, since ordinary explanations typically appeal to something else that already exists.
One reaction to this is defiant: attempt precisely the kind of account Hempel thinks cannot be produced—an explanation for “something rather than nothing” that does not presume the existence of something. Over time, many philosophers have tried to construct such arguments. But the deeper challenge may come even earlier than the details of any proposed solution. Why assume there must be an explanation in the first place?
Leibniz’s own motivation is central here. He thought an explanation is required because, intuitively, “nothing” seems easier than “something.” That judgment fuels much of the perplexity: if absence is the simplest state, why isn’t reality absent? The intuition resonates with a broader rule of thumb used in both science and everyday reasoning: simpler accounts tend to be more credible than complicated ones, all else equal. This is the spirit of Ockham’s Razor.
A classic scientific illustration comes from evolutionary biology. Whales and humans share striking similarities in skeletal structure despite living in very different environments. One could imagine an ad hoc story in which a creator independently chose these similarities. Darwin’s insight was that a simpler hypothesis—common descent—neatly explains why distant species share deep structural features. The appeal to simplicity does real work: it guides us toward explanations that fit evidence without multiplying assumptions.
Against that background, many traditional attempts to answer Leibniz’s question look incomplete. They offer a reason the Universe exists, but fail to confront the underlying intuition that nothingness would be the “simpler and easier” option. The puzzle is not merely to point to a cause, but to explain why reality is not replaced by the apparently more parsimonious alternative: nothing at all.
Why it matters
This question sits at the crossroads of philosophy, cosmology, and theology, shaping what counts as a satisfactory “ultimate” explanation. How we think about simplicity, evidence, and explanatory limits influences everything from arguments about the origin of the Universe to debates about whether some questions are beyond human inquiry. Watch for how future work in fundamental physics and philosophy of explanation tries to clarify whether “nothing” is even a coherent baseline—and whether the demand for an explanation here is justified.