Bellarmine's fourth proposition: Adam's rectitude was a supernatural gift; man's two propensions, from flesh and spirit, fight
This is what Bellarmine teaches in chapter 4 of his single book On the Grace of the First Man. His fourth proposition there reads: "The rectitude with which Adam was created, and without which all men have been born since his fall, was a supernatural gift."
To explain it, he first notes that by nature man is made of flesh and spirit, and so shares a nature partly with the beasts and partly with the angels. Because of the flesh, which he shares with the beasts, he has a leaning toward bodily, sensible good, which he pursues through sense and appetite. Because of the spirit, which he shares with the angels, he has a leaning toward spiritual, intelligible good, which he pursues through understanding and will.
From these different, even opposed, leanings a kind of conflict arises within one and the same man, and from that conflict a great difficulty in doing good, as one leaning hinders the other.
Latin
IX. Haec est doctrina Bellarmini de gratia primi hominis libro unico, cap. 4. Ubi haec est ejus quarta propositio, Rectitudo illa cum qua Adamus creatus fuit, & sine qua post ejus lapsum omnes homines nascuntur, donum supernaturale fuit. Quam propositionem ut explicet, observat primo hominem naturaliter constare ex carne & spiritu, & ideo partim cum bestiis, partim cum Angelis communicare naturam: & quidem ratione carnis & communionis cum bestiis, habere propensionem quandam ad bonum corporale & sensibile, in quod fertur per sensum & appetitum: ratione vero spiritus & communionis cum Angelis, habere propensionem ad bonum spirituale & intelligibile, in quod fertur per intelligentiam & voluntatem. Ex his autem diversis vel contrariis propensionibus existere in uno eodemque homine pugnam quandam & ex ea pugna ingentem bene agendi difficultatem, dum una propensio alteram impedit.