Thesis IV. To explain where the efficacy of divine grace comes from, he first notes two extremes to be avoided. The efficacy of grace for conversion must not be credited to the cooperation of the human will, nor to an absolute decree of God choosing certain particular people. One must take a middle way instead.
That many are converted and saved is to be put down to divine grace alone; that many are not converted and are lost must be recognized as happening only through the fault of those who are lost. In this devout simplicity, he says, a Christian mind can rest secure, even if it cannot find its way out of every difficulty.
Latin
IV. Caeterum ut explicet unde sumatur gratiae Divinae efficacia, observat primo duo extrema cavenda esse; neque enim efficaciam gratiae ad conversionem, tribuendam esse cooperationi voluntatis humanae; nec etiam tribuendam absoluto Dei certos quosdam homines eligentis decreto, sed incedendum via media: quod multi convertuntur & salvantur ad solam gratiam divinam referri debere, quod multi non convertuntur & pereunt, agnoscendum esse ipsorum pereuntium culpa unice fieri: atque in hac pia simplicitate mentem Christianam secure acquiescere posse, etsi ex omnibus difficultatibus non valeret sese expedire.