Is only when the mind receives the impression.§ 2. What perception is, every one will know better by reflecting on what he does himself, what he sees, hears, feels, &c. or thinks, than by any discourse oi mine. Whoever reflects on what passes in his own mind, cannot miss it: and if he does not reflect, all the words in the world cannot make him have any notion of it.
§ 3. This is certain, that whatever alterations are made in the body, if they reach not the mind; whatever impressions are made on the outward parts, if they are not taken notice of within; there is no perception. Fire may burn our bodies, with no other effect than it does a billet, unless the motion be continued to the brain, and there the sense of heat, or idea of pain, be produced in the mind, wherein consists actual perception.
§ 4. How often may a man observe in himself, that whilst his mind is intently employed in the contemplation of some objects, and curiously surveying some ideas that are there, it takes no notice of impressions of sounding bodies made upon the organ of hearing, with the same alteration that uses to be for the producing the idea of sound ? A sufficient impulse there may be on the organ; but if not reaching the observation of the mind, there follows no perception; and though the motion that uses to produce the idea of sound be made in the ear, yet no sound is heard. Want of sensation, in this case, is not through any defect in the organ, or that the man's ears are less affected than at other times when he does hear: but that which uses to produce the idea, though conveyed in by the usual organ, not being taken notice of in the understanding, and so imprinting no idea in the mind, there follows no sensation. So that wherever there is sense, or perception, there some idea is actually produced, and present in the understanding.
Children, though they§ 5. Therefore I doubt not but children, by the exercise of their senses about ob-
