Strang's answer: whatever is absolutely future is necessary on the hypothesis that it is future
'But,' says that learned man, 'whatever God foresees as absolutely future, however contingent it may be in itself and able, strictly speaking, not to be, is still necessary on a hypothesis. The hypothesis is not some divine predetermining decree, but simply that it is future.
Just as whatever is, is necessarily while it is, so whatever is future, by the very fact that it is assumed to be future, is necessarily future. And so God can know it with certainty.'
Latin
LXI. Sed, ait vir ille Doctus, quicquid Deus praevidet ut absolute futurum, quantumlibet in se contingens sit, & simpliciter loquendo possit non esse, necessarium est tamen ex hypothesi, non quidem ex hypothesi divini alicujus decreti praedeterminantis, sed ex hac illa ipsa hypothesi quod futurum est. Etenim quemadmodum quicquid est, dum est, necessario est; ita etiam quicquid futurum est, hoc ipso quod supponitur futurum, necessario futurum est, & sic a Deo certo cognosci potest.