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If reason (I mean abstract reason, derived from inquiries a priori) be not alike mute with regard to all questions concerning cause and effect, this sentence at least it will venture to pronounce, That a mental world, or universe of ideas, requires a cause as much, as does a material world, or universe of objects; and, if similar in its arrangement, must require a similar cause. For what is there in this subject, which should occasion a different conclusion or inference? In an abstract view, they are entirely alike; and no difficulty attends the one supposition, which is not common to both of them.

David Hume#65

MindCausalityIdeasMetaphysicsReality

About this quote

What does it mean?
Hume argues that if a material universe needs a cause, so too must a mental or ideal universe.
In plain terms
If matter needs a cause, ideas need a cause too.
What can you take from it?
Apply the same causal rules to ideas and matter.

Where it applies

  • philosophical debate
  • theology

Putting it to work

  • challenging dualism

Questions to consider

  • Do ideas need causes?
  • How do we explain existence?

Another view

The analogy assumes mental and material worlds share the same nature.

More from David Hume

  1. What peculiar privilege has this little agitation of the brain which we call thought, that we must thus make it the model of the whole universe? Our partiality…

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  2. In a word, CLEANTHES, a man who follows your hypothesis is able perhaps to assert, or conjecture, that the universe, sometime, arose from something like design…

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  3. The same good sense, that directs men in the ordinary occurrences of life, is not hearkened to in religious matters, which are supposed to be placed altogether…

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