Hashem tells us through the prophet, לא מחשבותי מחשבותיכם – the human mind is not capable of understanding His ways in this world.  Part of being a Jew is knowing that we do not have to know the answers to all questions.  Emuna means that we do not understand everything.  It is belief – belief that Hashem is צדיק וישר, everything He does is correct and just.  ~ Divrei Chizuk