  Elisabeth’s critique is truly Cartesian since it builds on the criterion of clear and distinct intelligibility advocated by Descartes himself. La Forge addresses this concern by denying that even homogeneous or univocal causation (like body-body causation) is as intelligible as it looks. By showing that univocal causation among bodies is in fact impossible, La Forge aims to show that every form of causation entails an interaction between something corporeal and something spiritual. Hence, the case of mind-body interaction ceases to be a puzzling scenario and becomes an instance of a broader and more general account of causation.