Secondary, or reflective impressions are such as proceed from some of these original ones, either immediately or by the interposition of its idea.

Of the first kind are all the impressions of the senses, and all bodily pains and pleasures: Of the second are the passions, and other emotions resembling them.
It is certain, that the mind, in its perceptions, must begin somewhere; and that since the impressions precede their correspondent ideas, there must be some impressions, which without any introduction make their appearance in the soul.

As these depend upon natural and physical causes, the examination of them would lead me too far from my present subject, into the sciences of anatomy and natural philosophy.

For this reason I shall here confine myself to those other impressions, which I have called secondary and reflective, as arising either from the original impressions, or from their ideas.

Bodily pains and pleasures are the source of many passions, both when felt and considered by the mind; but arise originally in the soul, or in the body, whichever you please to call it, without any preceding thought or perception.