Full Idea
Consciousness is in the first place not a matter of 'I think' but of 'I can'.
Gist of Idea
Consciousness is based on 'I can', not on 'I think'
Source
Maurice Merleau-Ponty (Phenomenology of Perception [1945], p.159), quoted by Beth Lord - Spinoza's Ethics 2 'Sensation'
Book Reference
Lord,Beth: 'Spinoza's Ethics' [Indiana 2010], p.67
A Reaction
The point here (quoted during a discussion of Spinoza) is that you can't leave out the role of the body, which seems correct.