Halakhah zu Dewarim 31:17

And the general principle of our words is that every bad event that happens to a man is an action that happens to a man by God, may He be blessed, hiding His face from the man - meaning to say, that God, may He be blessed, removes His guarding from upon him, from the angle of his sin, until he receives the fitting punishment according to his sin. And then He commands His angels to guard him, as at first. And [it is] as it is written (Deuteronomy 31:17), "And I will hide My face from them and they will be for food, and many evils and troubles will find them; and they will say on that day, 'It is because our God is not among us, they found us, etc.'" And one sage wrote, "We know that God is one and the change [only] comes from the recievers. And God will not change His deeds, as they are all with wisdom" (Sefer Kuzari 4:3).