Walaeus' warning: it must not be used to make election depend on free choice, or to deny physical grace
But he teaches that we must take special care that no one misuses this knowledge. One misuse is to weigh the decree of election by the good use of a person's free choice. Those who do this hold that God, before electing someone, foresaw how that person would respond if this or that preventing and accompanying grace were offered him in this or that order of things or state. He foresaw whether the person would assent to it by free choice or not. On this view free choice determines God's grace for them, not the other way round.
The other misuse is to deny that God works efficaciously in the will of the person being converted, beyond moral instruction. As Walaeus expects to show later, God acts in a person's will not only morally but also physically when he converts him.
Latin
XXX. Sed praecipue cavendum esse docet, nequis ista scientia abutatur vel ad decretum electionis a bono usu liberi Arbitrii hominis perpendendum, ut faciunt illi qui volunt, Deum priusquam hominem elegit, praevidisse quomodo, si haec aut illa gratia praeveniens & concomitans, in hoc aut illo ordine rerum, vel in hoc aut illo statu homini offerretur, ille per liberum arbitrium ei esset assensurus, aut non assensurus, adeo ut liberum arbitrium gratiam Dei eis determinet, non contra. Vel etiam ad negandam omnem Dei operationem efficacem in hominis convertendi voluntate, praeter moralem institutionem: quoniam, ut postea demonstraturum se confidit, Deus non tantum moraliter, sed etiam Physice agit in hominis voluntate, quando eum convertit.