Jamieson, Fausset and Brown on Jeremiah 10:23

23. Despairing of influencing the people, he turns to God.

way of man not in himself--(Pr 16:1; 20:24; Jas 4:13, 14). I know, O Jehovah, that the march of the Babylonian conqueror against me (Jeremiah identifying himself with his people) is not at his own discretion, but is overruled by Thee (Is 10:5-7; compare Jr 10:19).

that walketh--when he walketh, that is, sets out in any undertaking.

direct ... steps--to give a prosperous issue to (Psa 73:23).