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About this quote

What does it mean?
Chesterton asserts that materialists and madmen share a lack of doubt, implying that absolute certainty is a hallmark of delusion.
In plain terms
Materialists and mad people never doubt themselves.
What can you take from it?
Absolute certainty is often a sign of flawed thinking.

Where it applies

  • discussing ideology
  • identifying dogma

Putting it to work

  • valuing skepticism
  • questioning certainties

Questions to consider

  • Is doubt always healthy?
  • When does certainty become dangerous?

Another view

It dismisses reasonable conviction as madness.

More from Gilbert Keith Chesterton

  1. The sane man knows that he has a touch of the beast, a touch of the devil, a touch of the saint, a touch of the citizen. Nay, the really sane man knows that he…

    Permalink to quote #120
  2. Spiritual doctrines do not actually limit the mind as do materialistic denials. Even if I believe in immortality I need not think about it. But if I disbelieve…

    Permalink to quote #122
  3. There is a very special sense in which materialism has more restrictions than spiritualism. Mr. McCabe thinks me a slave because I am not allowed to believe in…

    Permalink to quote #119

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