The big idea: Free speech protects your mind. But Mill wants more — the freedom to actually live differently, to shape your own life even when others think your choices are odd.
Individuality: He calls this individuality, and he thinks it's one of the main ingredients of a good life.
By individuality Mill means growing into your character, making choices that are genuinely yours — not just following what everyone around you happens to do.
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Mill gives this a memorable name that does a lot of work.
"Experiments in living": Mill says there should be "different experiments of living" — people trying out different ways to live, so we can see which ones actually work.
How better ways get found: Nobody knew in advance which foods, jobs, art forms or lifestyles would turn out to enrich human life; we found out because someone dared to be different. An experiment in living is how new and better ways of living get discovered at all.
Checkpoint — experiments in living: In one line: letting people live differently is how society discovers better ways to live — the good experiments teach everyone. Hold that — next: why mere custom can't do this job.
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Mill's warning is aimed at something that feels safe: just doing what's always been done.
The person who only follows custom: Someone who only ever copies custom, Mill says, is like a machine — they use no judgement of their own.
Choosing builds your powers: Choosing for yourself exercises "the human faculties of perception, judgement, discriminating feeling, mental activity" — muscles that waste away if you never use them. Custom might even be right, but a person who follows it only because it's custom never develops the powers that make a life fully human.
Go further — higher-level insight: See how individuality links to free speech. In 10.12.2 an unchallenged truth rots into dead dogma; here an unchallenged way of life rots into mere custom. Both arguments share one engine: things stay alive and improve only when they're tested by difference. Spotting that shared move across the whole book is a top-band synthesis point.
Checkpoint — custom: In one line: following custom just because it's custom leaves your own judgement unused — individuality is what keeps both a person and a society growing.