The hidden things belong to the Lord our God, but the revealed things belong to us and our children forever, so that we may follow all the words of this law.
We can only know about us, God and everything else what God reveals.
He reveals here that some things will not be revealed.
It’s not our job to uncover what He has hidden (incidentally how foolish an errand to attend to as though you could illuminate what He has left darkened)
Let’s break it down.
Walk: do something
By faith: trusting in the sufficiency, sovereignty and sweetness of Jesus to see it through
With wisdom: studying the things revealed in order to understand, apply and obey them
In freedom: knowing that the uncertain future is certain in Him and that the fate of your salvation and His Kingdom does not depend on your ability to save yourself or build His Kingdom.