Albert Barnes Commentary Jonah 2:6

"I went down to the bottoms of the mountains; The earth with its bars [closed] upon me for ever: Yet hast thou brought up my life from the pit, O Jehovah my God." — Jonah 2:6 (ASV)

I went down to the bottoms (literally “the cuttings off”) of the mountains—the “roots,” as the Chaldee and we call them, the hidden rocks, which the mountains push out, as it were, into the sea, and where they end. Such hidden rocks extend along the whole length of that coast.

These were his dungeon walls; the earth, her bars (those long submarine reefs of rock, his prison bars) were around him forever: the seaweeds were his chains.

And so, when things were at their uttermost, You have brought up my life from corruption, to which his body would have fallen prey had God not sent the fish to deliver him.

The deliverance for which he thanks God is altogether past: You brought me up. He calls the Lord, my God, because, being the God of all, He was especially his God, for whom He had done things of such marvelous love. God loves each soul which He has made with the same infinite love with which He loves all.

Thus Paul says of Jesus (Galatians 2:20), Who loved me and gave Himself for me. He loves each with the same undivided love, as if He had created no one else; and He allows each to say, My God, as if the Infinite God belonged wholly to each. So He would teach us the oneness of Union between the soul that God loves and that admits His love, and Himself.