Their teaching: all events, even free and contingent ones, are decreed by an absolute, energetic decree that cannot fail
Their teaching is this. By an absolute and, as they call it, 'energetic' decree of God, whatever is done even by free and contingent causes has been decreed and ordered. This decree can never fail, and what God has so decreed must without exception be fulfilled.
So the very things that contingent and free causes do are done necessarily with respect to this decree, and cannot turn out otherwise.
Latin
XXV. Nempe haec est eorum doctrina, Absoluto & energetico ut loquuntur Dei decreto quaecunque fiunt a causis etiam liberis & contingentibus decreta & ordinata esse. Hoc decretum nunquam irritum esse posse, sed omnino necesse esse ut impleantur quae sic a Deo decreta sunt. Adeoque illa ipsa quae causae contingentes & liberae operantur, hujus decreti respectu necessario fieri nec aliter evenire posse.