Yet they hold this leaves contingency intact: God decreed not only the event but its free mode
On their view, God by his eternal decree predetermined and predefined whatever is done in time by any cause. Even so, they maintain that nothing prevents many things from happening not by necessity but contingently and freely.
God's eternal providence did not provide necessary causes for every event and effect; for some it provided free or contingent causes. Nor did it determine only that this or that should happen; it also determined the way each thing should happen. So God willed some things to happen necessarily, and others contingently and freely.
Far from removing the freedom of human acts, then, God's eternal providence is the first cause to which whatever freedom and contingency there is in things must be traced. For God willed not only that things should be, but also by his will settled and defined the mode and manner in which each should be.
Latin
VIII. Quanquam autem Deus, ex eorum mente, aeterno suo decreto praedeterminaverit & praedefinierit quaecunque in tempore a causis quibuslibet fiunt, istud nihil obstare pertendunt quominus multa non necessario, sed contingenter & libere fiant: quoniam aeterna Dei providentia non omnibus eventibus & effectibus praeparavit causas necessarias, sed quibusdam causas liberas, sive contingentes; neque solum determinavit hoc vel illud fieri, sed etiam modum quo res quaeque fieret, adeoque voluit ut quaedam necessario, alia vero contingenter & libere fierent. Et sic tantum abest ut aeterna Dei Providentia libertatem tollat actuum humanorum, ut contra quicquid est in rebus libertatis & contingentiae ad ipsum tanquam ad causam primam referendum sit: quia, scilicet, Deus non tantum res esse voluit, sed etiam voluntate sua statuit & definivit modum & rationem quo singulae esse deberent.