The Age of Enlightenment:

abstract general ideas abstract ideas AGE OF ENLIGHTENMENT agreement or disagreement answer appear aqua regia argument assert belief Berkeley Berkeley's betwixt body causation cause and effect ceived certainty coexistence colour complex ideas conceive concerning connexion consider constant conjunction continued Descartes discover distinct ideas distinguishable doctrine empirical empiricism empiricist ence entities evident existence experience figure give human Hume Hume's ideas of substances identity imagination impossible instance intuitive intuitive knowledge J. G. Hamann Johann Georg Hamann knowledge Leibniz Locke Locke's logical mathematics matter means metaphysical mind motion nature never nominal essence observe ontology operations opinion particular perceive perceptions Phil philosophers primary qualities principle problem of universals produce properties propositions question real essence reason reflection relation resemblance secondary qualities sensation senses sensible qualities simple ideas smell sort species substratum suppose things thought tion triangle true truth understanding wherein words