Zeal, as explained in Swedenborg's writings, is a very different experience from that of anger. Zeal is a passion for a truly good cause, a good state, while anger is a passion for an evil cause. Zeal is more mild, even though it may be persevering. . . . Zeal propels us toward caring about another in a good way, while anger separates us from that person.
— Peter Rhodes, Observing Spirit