From above hath he sent fire into my bones, and it prevaileth against them: he hath spread a net for my feet, he hath turned me back: he hath made me desolate and faint all the day.
From above hath he sent fire into my bones - a fire which not only consumes the skin and flesh, but penetrates even to my bones - i:e., my vital powers.
It prevaileth against them - not as Rosenmuller: 'He (Yahweh) hath broken them;' a sense not in the Hebrew. He hath spread a net for my feet - (Ezra. 12:13). Image from hunting wild beasts. He has so entangled me in His judgments that I cannot escape.
He hath turned me back - so that I cannot go forward, and get free from His meshes. [Nun (n)]