Abstract

The purpose of this essay is to explain what the terms “formal cooperation” and “material cooperation” mean in the thought of St. Alphonsus Liguori, who is a pivotal figure in the Church’s tradition of reflection on cooperation and is often referenced when the distinction between formal and material cooperation in evil is discussed. The author explains why—and to some extent when—mainstream Catholic moralists who associate themselves with Alphonsus speak of some cooperation as formal and other cooperation as material. Specifically, he discusses two factors that are essential for the analysis of cooperation in evil— the meaning of the term “formal” and the role of “segments of intelligibility” in determining what is material rather than formal cooperation. National Catholic Bioethics Quarterly 13.4 : 663–675.