The link is a German source Googlized into English....sort of:
Mitfreude
Mitfreude is artificially a term used little in tying to the term compassion more made. One understands the desire at strange desire or the selbstlose participation in the joy of others by Mitfreude. The Mitfreude is heavy. "to the compassion", Jean Paul says , "is sufficient humans, to the Mitfreude belongs an angel." The egoist decides if necessary to the compassion, never however to the Mitfreude; but applies in practice of the life that more than these, because compassion becomes more easily working than Mitfreude. See Kant, Metaphys. D Customs §. 34.
