Full Idea
[Belief in thinking matter] leads to monstrous absurdities. …Every stock and stone would be a percipient and rational creature. …every single Atom of our bodies would be a distinct Animal, endued with self-consciousness and personal sensation of its own.
Gist of Idea
That all matter thinks is absurd, and would make each part of our bodies a distinct self-consciousness
Source
Richard Bentley (Matter and Motion Cannot Think [1692], p.14-15), quoted by Matthew Cobb - The Idea of the Brain 2
Book Reference
Cobb,Matthew: 'The Idea of the Brain' [Penguin 2020], p.45
A Reaction
Sounds correct, though presumably panpsychists don't think the flickers of consciousness in my toenails and hair constitute full-blown persons. I can't imagine what awareness is being claimed for my toenails.