Formal cause

Definition and stakes

P. Coffey,  Ontology, or the Theory of Being

“ Again, while efficient causation resolves itself into the categories of actio and passio, the causation of final, formal and material causes cannot be referred to these categories, but neither does it constitute any new category. The influence of a final cause consists in nothing more than its being a good which is the term of appetite or desire. The causation of the formal cause consists in its formally constituting the effect: it is always either a substantial or an accidental form, and so must be referred to the categories of substance, or quality, or quantity. ”
Source: Gutenberg

Portrait of John Stuart Mill John Stuart Mill,  A System of Logic, Ratiocinative and Inductive

“ And in practice, that particular condition is usually styled the cause, whose share in the matter is superficially the most conspicuous, or whose requisiteness to the production of the effect we happen to be insisting on at the moment. So great is the force of this last consideration, that it sometimes induces us to give the name of cause even to one of the negative conditions. ”
Source: Gutenberg

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