The big idea: People say 'that's just human nature' about almost everything — kindness, greed, jealousy, love. But is there really one nature we all share from birth, or are humans so different that there's nothing fixed underneath?
'Human nature' means the features you have not because of your country or family, but simply because you're human. If it exists, it's the same in everyone, everywhere.
Imagine: the desert-island child: Picture a child raised completely alone on an island — food, but no people, no language, no teaching.
Would they still grow up curious? Would they still feel fear, or laugh, or want company? Whatever you'd keep 'no matter what' is your guess at human nature.
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The most famous answer comes from ancient Greece.
Aristotle's function argument: Aristotle noticed that everything has a special job — its function. An eye is for seeing; a knife is for cutting. So what's the job only humans do? Not just growing (plants grow) or sensing (animals sense) — but reasoning. So our nature is to be the rational animal, and a good human life is one that uses reason well.
Checkpoint — Aristotle: In one line: everything has a job; the human job is reason; so the good life uses reason well. The next step is to ask whether nature really hands us a 'job' at all.
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A fixed shared nature is a bold claim, so weigh what's for and against it.
There IS a fixed nature
- Some reactions turn up everywhere — fear, laughter, wanting others
- Strength: explains what all humans have in common
- Weakness: who says nature has a purpose for us?
There is NO fixed nature
- Humans differ hugely across cultures and history
- Strength: explains our variety and freedom
- Weakness: ignores the traits that really do seem shared
Go further — higher-level insight: Aristotle's argument quietly slides from 'the activity special to us' to 'the purpose nature set us'. A knife has a purpose because a maker gave it one — but nobody obviously 'made' humans for a task. Naming that hidden step is a top-band move.