Now I am not so sure. Eventually he settled near Marseilles where he founded two monasteries, one for men and the other for women. Before his death in 435, he wrote the Institutes, containing some of his most penetrating insights into the ascetical struggle. In the Institutes, he focuses on the eight major vices vexing the monk, among which is the spiritus irae, the spirit of anger. Firmly in the negative.
Anger is, in short, a pernicious influence.
It leads astray. Malignant Source, Malignant Result Astounding in his psychological insightfulness, Cassian locates the source of Christian anger in the malignant need to control others. When we feel that others are not complying with our agendas, either by stubbornly refusing to do what we aver they ought or by perversely insisting on doing what we aver they ought not, we become angry. And so the fact that we are not angry ought not to result from another's perfection, but from our own virtue . . . If we come into the grip of this ruinous aftereffect of anger, we find endless excuses for further anger.