God decreed not only that men act but that they act freely, choosing by their own judgement with power for the opposite
So, in these doctors' view, God's having decreed from eternity that men should do this or that, and that their wills should be drawn to these or those objects, is no obstacle to human freedom. God did not decree simply that they should do this or that, but that they should do it freely.
That is, they were to choose this or that by the judgement of their own reason as most fitting and advantageous for themselves, and in such a way that, judging differently, they could choose the opposite. On their view human freedom properly consists in this, so the determination made by the divine decree does not overturn it.
Latin
IX. Itaque quod Deus ab aeterno decrevit ut homines hoc aut illud agerent, & voluntate sua in haec vel illa objecta ferrentur, juxta sensum istorum Doctorum nihil hominum libertati officit: quia Deus non simpliciter decrevit ut hoc aut illud agerent, sed etiam ut libere agerent, id est, ut ex propriae rationis judicio hoc vel illud tanquam sibi maxime conveniens & commodum eligerent, & quidem ita ut ex diverso judicio oppositum eligere possent, qua in re, juxta eorum sententiam, proprie consistit libertas humana, quam proinde non evertit decreti divini determinatio.