Even if 'human nature' is an abstraction, biological facts about human capacities and vulnerabilities exist, justifying some nature-grounded excellences independent of Stirner's nominalism.

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Capacities(as what the soul possesses): Abilities or powers something has—the potential to do something (like how your brain has the capacity for both sensing and thinking).
Human nature(as used in metaphysics and philosophy of human identity): The fundamental characteristics, qualities, or essence that make something human and typically shared by all humans.
Max Stirner(as used in metaphysics and philosophy of language): A 19th-century German philosopher who argued that only individual things are real and that abstract concepts (like 'human nature') are just mental constructs with no real existence.
Nature-grounded excellences(as the kind of good that Hurka's perfectionism is based on): Skills and qualities that are considered excellent because they develop what is natural or inherent to human beings, like reason, creativity, or physical capability.

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