God cannot create a rational creature unable to do good, but a creature can bring evil habits on itself
It does clash with God's goodness, justice and wisdom for him to form an intelligent or rational, and therefore free, creature that cannot do good and has some necessity of doing evil placed in it by God himself. God, supremely good and great, cannot create anything that is not good.
But a creature that God made good can become evil by its own fault and vice. By doing evil it can acquire habits that fix it on evil so firmly that it can no longer do good. Its will is then hardened in evil and cannot, without the help of divine grace, free itself from the snares it has willingly walked into.
Latin
XXXV. Repugnat quidem divinae bonitati, justitiae, & sapientiae, ut formet creaturam aliquam intelligentem, sive rationalem, adeoque liberam, quae bene agere non possit, & quae necessitatem aliquam male agendi a Deo ipsam inditam habeat. Nec enim Deus Opt. Max. quicquam creare potest quod bonum non sit. Sed creatura quae bona a Deo producta fuit, culpa & vitio suo potest fieri mala, & eos male agendo contrahere habitus quibus ad malum ita determinetur, ut amplius bene agere non possit; voluntate, scilicet, in malo obdurata, nec valente, nisi gratiae divinae auxilio, sese ex iis laqueis extricare in quos sese ultro induit.