A Philosophical Enquiry into the Origins of the Sublime and Beautiful: And Other Pre-Revolutionary Writings, ed. David Womersley (New York: Penguin, 1998). Originally published 1757.
The passions which belong to self-preservation turn on pain and danger; they are simply painful when their causes immediately affect us; they are delightful when we have an idea of pain and danger, without being actually in such circumstances; this delight I have not called pleasure, because it turns on pain, and because it is different enough from any idea of positive pleasure. Whatever excites this delight, I call sublime. The passions belonging to self-preservation are the strongest of all the passions.
The second head to which the passions are referred with relation to their final cause, is society. There are two sorts of societies. The first is, the society of sex. The passion belonging to this is called love, and it contains a mixture of lust; its object is the beauty of women. The other is the great society with man and all other animals. The passion subservient to this is called likewise love, but it has no mixture of lust, and its object is beauty; which is a name I shall apply to all such qualities in things as induce in us a sense of affection and tenderness, or some other passion the most nearly resembling these. The passion of love has its rise in positive pleasure; it is, like all things which grow out of pleasure, capable of being mixed with a mode of uneasiness, that is, when an idea of its object is excited in the mind with an idea at the same time of having irretrievably lost it. This mixed sense of pleasure I have not called pain, because it turns upon actual pleasure, and because it is, both in its cause and in most of its effects, of a nature altogether different.
Next to the general passion we have for society, to a choice in which we are directed by the pleasure we have in the object, the particular passion under this head called sympathy has the greatest extent. The nature of this passion is, to put us in the place of another in whatever circumstance he is in, and to affect us in a like manner; so that this passion may, as the occasion requires, turn either on pain or pleasure …