This active or vivid class of ideas comprehends the passions.

The functions of the mind here described, exist then in different forms and degrees, from the simple idea, to the highest energy of passion: and the terms, thought, sentiment, emotion, feeling, and passion, are but the verbal signs of these degrees and forms.

Nor does there appear to be any line of classification, for separating thought from passion: since simple thoughts, without changing their nature, do, from interest or incitement, often assume the colour of passion."-- _Philosophy of the Human Voice_, p.

328.
4.

Lord Kames, in the Appendix to his Elements of Criticism, divides _the senses_ into external and internal, defining _perception_ to be the act by which through the former we know outward objects, and _consciousness_ the act by which through the latter we know what is within the mind.