Now it is evident, that in the first case, hatred always follows upon the contrariety of interests; as in the second, love arises from their union.

Let us consider to what principle we can ascribe these passions.
It is plain they arise not from the double relations of impressions and ideas, if we regard only the present sensation.

For takeing the first case of rivalship; though the pleasure and advantage of an antagonist necessarily causes my pain and loss, yet to counter-ballance this, his pain and loss causes my pleasure and advantage; and supposing him to be unsuccessful, I may by this means receive from him a superior degree of satisfaction.

In the same manner the success of a partner rejoices me, but then his misfortunes afflict me in an equal proportion; and it is easy to imagine, that the latter sentiment may in many cases preponderate.

But whether the fortune of a rival or partner be good or bad, I always hate the former and love the latter.
This love of a partner cannot proceed from the relation or connexion betwixt us; in the same manner as I love a brother or countryman.