Here, the word picture for Egypt is that of a refiner by fire - to purify the people.
I am led to think of situations and circumstances that we are waddling through now as part of our 'iron foundry' - allowed by God, so that we do become pure!
How wonderful are Your ways, LORD!!!! How beautiful and perfect your Fatherly love for us!! You know us, you know what we need and when we need it; You alone are GOD!!!
"That is why you must now know, and fix in your heart, that the LORD is God in the heavens above and on earth below, and that there is no other." --- Deuteronomy 4:39