For our idea of substance is equally obscure, or none at all, in both: it is but a supposed I know not what, to support those ideas we call accidents.

It is for want of reflection that we are apt to think that our senses show us nothing but material things.

Every act of sensation, when duly considered, gives us an equal view of both parts of nature, the corporeal and spiritual.

For whilst I know, by seeing or hearing, &c., that there is some corporeal being without me, the object of that sensation, I do more certainly know, that there is some spiritual being within me that sees and hears.
This, I must be convinced, cannot be the action of bare insensible matter; nor ever could be, without an immaterial thinking being.
16.

No Idea of abstract Substance either in Body or Spirit.
By the complex idea of extended, figured, coloured, and all other sensible qualities, which is all that we know of it, we are as far from the idea of the substance of body, as if we knew nothing at all: nor after all the acquaintance and familiarity which we imagine we have with matter, and the many qualities men assure themselves they perceive and know in bodies, will it perhaps upon examination be found, that they have any more or clearer primary ideas belonging to body, than they have belonging to immaterial spirit.
17.