The final cause of the difference between the passions belonging to Self-Preservation and those which regard the society of the sexes.

The final cause of the difference in character between the passions which regard self-preservation, and those which are directed to the multiplication of the species, will illustrate the foregoing remarks yet further; and it is, I imagine, worthy of observation even upon its own account. As the performance of our duties of every kind depends upon life, and the performing them with vigor and efficacy depends upon health, we are very strongly affected with whatever threatens the destruction of either: but as we were not made to acquiesce in life and health, the simple enjoyment of them is not attended with any real pleasure, lest, satisfied with that, we should give ourselves over to indolence and inaction. On the other hand, the generation of mankind is a great purpose, and it is requisite that men should be animated to t............