Why premotion is needed: dependence on the First Cause, not only the fall
Thesis LI. These doctors do not derive the need for this aid, which effectively premoves and predetermines the will to every devout action, simply from the corruption and weakness of the human will. They derive it in general from the dependence of every secondary cause on the First Cause, without whose impulse and prior motion, on their assumptions, no cause can do anything at all; and further from the indifference of the free will, which is not fit to do anything unless a higher agent determines it.
Latin
LI. Caeterum necessitatem auxilii istius voluntatem efficaciter ad omnem piam operationem praemoventis & praedeterminantis non arcessunt simpliciter ex voluntatis humanae corruptione & infirmitate; sed in genere ex dependentia omnis causae secundae a Prima, sine cujus impulsu & praevia motione, nulla causa est quae quicquam agere possit, juxta ipsorum hypotheses. Ac praeterea ex indifferentia liberae voluntatis, quae non est apta ut aliquid agat, nisi ab agente superiori determinetur.