The big idea: The cogito told Descartes he is a thinking thing. Now he takes a bolder step.
Mind, not body: The thing he essentially is — the 'I' that's certain — is a mind, and that mind is a completely different kind of thing from his body. You have a body, but what you are, deep down, is a thinker.
This is dualism. Descartes splits reality into two: the res cogitans (which thinks but takes up no space) and the res extensa (which takes up space but doesn't think).
Hold onto this: The mind is defined by thinking, the body by extension (taking up space). Because their essences are so different, Descartes argues they must be two separate things.
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Descartes' cleverest support for putting the mind first is a small experiment with a piece of wax.
A piece of wax
Fresh from the hive
It's hard, smells of flowers, is a certain shape and colour.
Near a flame
Everything the senses reported changes — it melts, the smell fades, the shape and colour go.
Still the same
Yet you judge it's still the same wax.
Fresh · Heated · Still the same
Not this
- Not the senses (they've reported nothing but change)
- Not your imagination (you can't picture all the shapes it could take)
But this
- Your mind grasps the wax as one flexible, extended thing running through all those changes
So what tells you it's the same wax?: The senses show the surface; the mind grasps what it really is.
Checkpoint — the wax: In one line: the wax's sensed qualities all change, yet the mind grasps it as one thing — so the mind, not the senses, knows what things really are. Hold that — it's why Descartes trusts the mind over the body.
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Descartes then argues the mind isn't just first — it's a different thing entirely from the body.
The clear-and-distinct argument
Mind without body
I can clearly conceive myself existing as a pure thinking thing, with no body at all.
Body without mind
And I can conceive a body with no thought (a corpse, a machine).
So, really distinct
If I can clearly conceive of each existing without the other, then God could make them exist apart — so they must be two really distinct things.
Conceive apart · God could separate · Distinct
The upshot: The mind could, in principle, carry on without the body.
Go further — higher-level insight: The clear-and-distinct argument has a famous soft spot: being able to conceive mind and body apart may only show they seem separable, not that they really are. (Arnauld pressed this at the time.) Flagging that gap between 'I can imagine it' and 'it's really so' is a strong evaluative move for part (b).