The necessity of a being's existence does not follow from the identity of its essence with existence unless one already presupposes the ontological argument's validity, which Kant decisively challenged.

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Kant(as used in epistemology and metaphysics): Immanuel Kant (1724-1804) was an influential German philosopher who argued that our minds shape how we experience reality, and that we can only truly know things as they appear to us, not as they are in themselves.
Necessity (of existence)(metaphysics and logic): When something *must* exist or *has* to exist, rather than just happening to exist by chance. Something necessary cannot fail to exist.
Presupposes(as describing what Plantinga's argument takes for granted): Assumes something to be true without proving it—like how an argument might presuppose that logic works, without first arguing that logic is valid.
essence(Medieval realist metaphysics): The defining nature of a species, held by some to be distinct from and capable of surviving the destruction of all individual members of that species

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