Thy way is in the sea, and thy path in the great waters, and thy footsteps are not known.
Thy way (is) in the sea. The general inference from the particular case of the redemption of Israel at the Red Sea, as above, in Psalms 77:13. So Nahum 1:3. God's way is one open to Him alone: for He to whom is possible what is impossible to man (Psalms 77:14) can make a path through even the pathless waters (Isaiah 51:10; Isaiah 51:15; Isaiah 63:11-12, which seems to have in view this passage; Habakkuk 3:15). This encourages His people to hope for deliverance even now, m their deep waters of trial (Isaiah 43:2).
And thy path. So the Qeri' reading; but the Hebrew text, Ketib, 'thy paths' - i:e., thy many ways of leading thy people in difficulties.
And thy footsteps are not known - even as at the Red Sea no traces were left of the steps whereby thou didst lead Israel through the Red Sea, the waters having returned (Exodus 14:26-28). So all God's ways (Romans 11:33).