The vineyard: God was not in doubt, but had used means from which a man could rightly hope for fruit
Similarly, in Isaiah the Lord is said to have expected grapes from his vineyard when it yielded wild grapes. This is not because God was uncertain or in doubt about what the Jewish people, represented by that vineyard, would do after so many means had been used to form them to true godliness.
It is because he had done what ought plainly to have brought that people back to the right path. Had one man used such means toward another, he could rightly have hoped and expected that the other's heart would be softened by them and turned to love and willing obedience.
Latin
XV. Similiter apud Isaiam, Dominus a vinea sua dicitur expectasse uvas cum illa fecerit labruscas; non quod Deus anceps & dubius esset de eo quod faceret populus Judaicus, vinea ista figuratus, post tot adhibita media ad illum ad veram pietatem formandum; sed quoniam ea fecerat quae plane populum istum in rectam viam reducere debebant, & quae, si homo erga hominem adhibuisset, legitime sperare & expectare posset cor ejus inde emolliendum esse, & flectendum ad amorem & ultroneum obsequium.