The passions of love and hatred are always followed by, or rather conjoin’d with benevolence and anger. ’Tis this conjunction, which chiefly distinguishes these affections from pride and humility. … We may, therefore, infer, that benevolence and anger are passions different from love and hatred, and only conjoin’d with them, by the original constitution of the mind.
Hume seems to have been wrong: by introducing additional distinct passions to those of love and hatred, he moves away from his system of four passions.
But Hume will not admit he was faulty: this addition would actually be compatible, even coherent with his system.