'Muddy' in the Bible

He brought me up from a desolate pit,out of the muddy clay,and set my feet on a rock,making my steps secure.

“Son of man, lament for Pharaoh king of Egypt and say to him:You compare yourself to a lion of the nations,but you are like a monster in the seas.You thrash about in your rivers,churn up the waters with your feet,and muddy the rivers.”

Isn’t it enough for you to feed on the good pasture? Must you also trample the rest of the pasture with your feet? Or isn’t it enough that you drink the clear water? Must you also muddy the rest with your feet?