Courses
Philosophy Ideas & discovery

How do we know what is true

Understand what it means to know something, using claims you meet every day.

Distinguish a claim being true, believing it and having good grounds for the belief. They are connected but not identical. Philosophers disagree about a complete definition of knowledge; ordinary cases can show why confidence or a lucky correct answer is not enough.

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Start with three things you can do today

A starting goal

I want to understand how philosophers think about knowledge and belief. Explore evidence, skepticism, and certainty through claims I might encounter in everyday life.

Change any word so it fits your situation. The course is built from what you type and a few setup questions.

Start today

Three things you can do before the course exists.

Useful on their own. The course is for when you want the whole skill, not just the first move.

  1. Try the stopped-clock problem

    A familiar philosophical example: a clock has stopped at two o'clock. You look at it exactly when the actual time is two and conclude that it is two. Your belief happens to be true, but the clock was not reliably telling you the time.

  2. Identify what the example challenges

    You believed the answer and had what seemed to be a normal reason for it. Yet its accuracy depended on luck. The Stanford analysis of knowledge discusses why cases like this challenge a simple account of knowledge as justified true belief. This does not settle every proposed alternative.

  3. Apply the distinction to a claim you encounter

    If a forecast happened to be right, ask whether its method and evidence supported it before the outcome was known. A lucky result does not validate every method. Conversely, uncertainty does not make a factual claim a mere preference; examine the kind of claim and the available grounds.

Sources: Stanford Encyclopedia of Philosophy: analysis of knowledge and epistemic luck. Practical examples are starting points, not promised results.

Best for
Philosophy
Prerequisites
None. Bring the situation you have.
Course length
7 to 30 lessons
Pace
Yours. One lesson at a time, as often as you like.
Format
Read it, or play the audio
Access
Available on the App Store and Google Play, with an optional early testing list

Before the course is built

Setup asks about your situation first.

Lesson 1 opens on the moment you describe, and the examples use your role. For this request, expect questions like these.

  1. What raises the question for you: misinformation, science, religion, or philosophy itself?
  2. Do you tend toward too much certainty or too much doubt?
  3. Is there a claim you are trying to decide whether to believe?

Right for now

If any of this sounds familiar, start here.

Everyone is certain and you are not sure of anything

Confidence is everywhere and you cannot find the ground.

You want to know what counts as evidence

Testimony, experience, authority and data all claim the title.

You are drawn to the big questions

How do we know anything is a question you keep returning to.

Course arc

Where the course goes, in order.

Cadence writes the lessons for you, so the exact path follows your answers. This is the ground a course built from this sentence covers.

01 / 06

Knowledge and belief

Justified true belief, its famous problems, and why the question is practical.

Skepticism

Ancient and modern doubt, and what it leaves standing.

Perception and testimony

What your senses and other people can and cannot establish.

Reason and evidence

Deduction, induction and how science justifies claims.

Certainty

Why absolute certainty is rare and why that is fine.

Everyday epistemology

Applying the ideas to news, experts and your own strong beliefs.

What changes

What you will be able to do, and what you will stop believing.

You will be able to

Distinguish belief, truth and justification

Compare belief, truth and justification, then test what counts as knowledge.

Weigh kinds of evidence

Rate testimony, perception, reasoning and authority for a given claim.

Calibrate your confidence

Hold beliefs with degrees of certainty that match the support.

Ideas this course corrects

Feeling certain establishes knowledge

Confidence is a psychological state. Ask whether the claim is true and the reasons are reliable.

A claim that cannot be tested in one way must be a preference

Mathematical, conceptual and empirical claims call for different kinds of justification. Avoid one test for every kind of question.

Course questions

What to know before you start.

How do we know what is true: what can I do today?

Try the stopped-clock problem. A familiar philosophical example: a clock has stopped at two o'clock. You look at it exactly when the actual time is two and conclude that it is two. Your belief happens to be true, but the clock was not reliably telling you the time. Identify what the example challenges. You believed the answer and had what seemed to be a normal reason for it. Yet its accuracy depended on luck. The Stanford analysis of knowledge discusses why cases like this challenge a simple account of knowledge as justified true belief. This does not settle every proposed alternative. Apply the distinction to a claim you encounter. If a forecast happened to be right, ask whether its method and evidence supported it before the outcome was known. A lucky result does not validate every method. Conversely, uncertainty does not make a factual claim a mere preference; examine the kind of claim and the available grounds.

Is this a fixed course?

No. Cadence builds the course when you type the sentence and answer a few setup questions, so the lessons follow your situation. This page describes what a course built from this request covers. You see the whole path before Lesson 1.

Who is this course for?

Distinguish a claim being true, believing it and having good grounds for the belief. They are connected but not identical. Philosophers disagree about a complete definition of knowledge; ordinary cases can show why confidence or a lucky correct answer is not enough. It sits under Philosophy in the Ideas & discovery part of the library.

Do I need any prior experience?

No. Setup asks what you already know and where you want to use it, and the course starts from there. Bring a real situation if you have one; the examples are built around it.

How long does it take?

Most courses run 7 to 30 lessons. The course length is sized to what you asked for. You set the pace: one lesson at a time, as often as you like. Lessons can be read or played as audio.

Does this course award a certificate or degree?

No. Cadence is for practical self-learning and does not award accredited degrees or professional certification.

Start today

Type it, answer a few questions, open Lesson 1.

A starting goal

I want to understand how philosophers think about knowledge and belief. Explore evidence, skepticism, and certainty through claims I might encounter in everyday life.

Want new features first?