Full Idea
Those who say that the soul is incorporeal are speaking to no point; for if it were of that character, it could neither act nor be acted upon at all.
Gist of Idea
The soul cannot be incorporeal, because then it could neither act nor be acted upon
Source
Epicurus (Letter to Herodotus [c.293 BCE], 67)
Book Reference
Epicurus: 'The Epicurus Reader', ed/tr. Inwood,B. /Gerson,L. [Hackett 1994], p.14
A Reaction
This just is the causal argument, which is espoused by Papineau and other modern physicalists. Personally I am inclined to agree with Papineau, that it is so simple and conclusive that it is hardly worth discussing further. Dualism needs a miracle.
Related Idea
Idea 14043 The void cannot interact, but just gives the possibility of motion [Epicurus]