The Socinians' chief motive: certain foreknowledge would make God's earnest exhortations pointless
Those who today maintain that God has no certain foreknowledge of future contingents are moved chiefly by this. If God foresees with certainty, and from eternity, what human beings will freely do, then in their view he cannot seriously warn, exhort and implore them to turn and repent.
'What need is there,' they ask, 'to exhort and press someone earnestly to do what you know for sure he will do? And what is the good of much pleading and imploring with someone who, as you well know, will do none of the things you ask?'
Latin
XIX. Sed qui hodie contendunt in Deo non esse certam praescientiam futurorum contingentium, eo praecipue moventur quod, si ea quae libere homines facturi sunt Deus certo praevidet, & quidem ab aeterno, non potest, ut ipsi existimant, homines serio monere, hortari, atque obtestari, ut convertantur atq; resipiscant. Ad quid enim opus est sollicite aliquem hortari atque compellere, ut faciat id quod pro comperto habes illum esse facturum; aut cui bono uti sollicitatione, & obtestatione multa, apud eum quem exploratum tibi est nihil eorum quae rogas facturum esse?