Self-love, the spring of motion, acts the soul;
Reason's comparing balance rules the whole.
Man, but for that no action could attend,
And, but for this, were active to no end:
Fix'd like a plant on his peculiar spot,
To draw nutrition, propagate, and rot;
Or, meteor-like, flame lawless thro' the void,
Destroying others, by himself destroy'd.

An essay on man. Enlarged and improved by the author. With the commentary and notes of mr. Warburton (ed. 1748)