Modes of these simple ideas of reflection are remembrance, discerning, reasoning, judging, knowledge, faith. It has, further, pleased our wise Creator to annex to several objects and to the ideas which we receive from them, as also to several of our thoughts, a concomitant pleasure, and that in several objects to several degrees, that those faculties which He has endowed us with might not remain wholly unemployed by us. Pain has the same efficacy and use to set us on work that pleasure has, we being as ready to employ our faculties to avoid that as to pursue this. Existence and unity are two other ideas that are suggested to the understanding by every object without and every idea within. Nor let anyone think these too narrow bounds for the capacious mind of man to expatiate in, which takes its flight farther than the stars and cannot be confined by the limits of the world, that extends its thoughts often even beyond the utmost expansion of matter and makes excursions into that incomprehensible inane.
Qualities are, first, such as are utterly inseparable from the body in what state soever it be.
These secondary qualities are colours, sounds, tastes, etc. But light, heat, whiteness, or coldness are no more really in them than sickness or pain is in manna.