Lesson · 4 min Steady
Trusting Others
In one line Most of what we know comes from others, so the skill is knowing whom to trust and how much.
Hume built knowledge on experience, yet he called reasoning from what others tell us one of the most common and useful kinds there is. Think how much of what you know rests on others: your birthday, the shape of distant countries, how your medicine works. Testimony, what others tell us, is a main road to knowledge.
That does not mean believing everyone. Trust is reasonable when the speaker is placed to know, has no strong motive to mislead, and agrees with other sources. A mechanic speaking about your car, a map from a good survey and a report confirmed by several outlets all earn more trust than a stranger’s rumor.
So test the speaker, not only the claim. Ask how they know, what they gain, and whether independent sources agree. Extend trust in proportion.
The rumor and the water report
Lia hears from a neighbor that her water is unsafe to drink. She has no test kit. The neighbor heard it from a cousin who read a post.
Lia checks the city’s water report, which lists recent test results, and calls the utility. Both say the water is fine. She trusts them more than the chain of rumor, because they are placed to know, and they agree.
Try this today Pick one belief you hold on someone’s word, and write why that person is placed to know.
Cite or share this lesson
A plain reference you can paste into notes or an essay:
Quest2Reason. “Trusting Others.” https://quest2reason.com/learn/lesson/trusting-others. Accessed 13 November 2026.
Sources
- Stanford Encyclopedia of Philosophy, “Epistemological Problems of Testimony” — Covers when it is reasonable to believe what others tell us.
- David Hume, An Enquiry Concerning Human Understanding (1748), section X, part 1 — Calls reasoning from testimony common, useful and necessary, rests it on experience, and lists what weakens it: witnesses who disagree, are few, or have an interest.