The free acts of faith and the infused habit
Thesis CIII. 'Even when these two motions of prevenient grace have helped and roused it, free choice remains free to command the assent of faith or to withhold that command. Suppose the will decides to embrace the faith and orders the intellect to believe. Then, as the motion of prevenient grace it possesses flows in alongside, the will produces within itself a supernatural act: in that act it wills to embrace the faith, and by that act it orders the intellect to assent.
In the same moment the intellect, set in motion by the will's supernatural command and aided by God's light, produces a supernatural act of assent to what God has revealed. A person rightly prepared by these two supernatural acts, one of intellect and one of will, then receives from God alone the infused, supernatural habit of faith, which enables him afterwards to produce further acts of the same supernatural kind.'
Latin
CIII. Porro liberum arbitrium his duobus motibus gratiae praevenientis adjutum & excitatum, liberam adhuc habet potestatem imperandi, aut non imperandi assensum fidei. Quod si voluntas fidem amplecti velit, actumque credendi imperet intellectui, influente simul motu gratiae praevenientis, quam habet, elicit in seipsa actum supernaturalem, quo fidem amplecti vult, quoque assensum imperat intellectui: simulque intellectus motus imperio illo supernaturali voluntatis, illustrationeque divina adjutus, elicit actum supernaturalem assentiendi revelatis, hisque duobus actibus supernaturalibus intellectus & voluntatis homo rite dispositus suscipit habitum fidei supernaturalem, a Deo solo infusum, quo deinceps similes actus supernaturales valeat producere.