Calixtus: supernatural acts and acts within man's power
Thesis IX. That author draws a distinction. On one side are actions supernatural in kind: they exceed human strength by their nature, are not in human hands, and so must be credited to the Holy Spirit. Believing, fearing and loving God, and the like, in which true conversion to God consists, are of this sort.
On the other side are certain acts within a person's power, which God wants him to perform before any advance is made to supernatural aids and gifts, at least in the ordinary course. Such acts are hearing God's word, studying it, paying attention to it, and taking some care about the means of salvation.
Latin
IX. Distinguit enim author ille inter actiones suo genere supernaturales, id est, quae natura sua vires humanas superant, nec in hominum manu positae sunt, & propterea spiritui sancto sunt ascribendae, quales sunt credere, Deum timere atque diligere, aliaeque similes, quibus constat vera ad Deum conversio: & inter actus quosdam in hominis potestate sitos, quos ab ipso Deus praestari velit, priusquam ad auxilia & dona supernaturalia progressus fiat, saltem quoad modum ordinarium. Quales actus sunt verbum Dei audire, illud scrutari, ad illud attendere, & de mediis ad salutem curam aliquam suscipere.