Joseph Benson's Commentary of the Old and New Testaments - Psalms 18:36
Psalms 18:36. Thou hast enlarged my steps Which before were confined within narrow limits, and entangled with the straitness and difficulty of the way. Thou hast set my feet in a large room, Psalms 31:8; Psalms 118:5. It must be observed, that the eastern writers were wont to denote any person’s condition in life by his steps, or goings. Hence narrow, or straitened steps, according to their phraseology, signified a state of distress and great affliction; and large and unconfined... read more
Albert Barnes' Notes on the Whole Bible - Psalms 18:36
Thou hast enlarged my steps under me - The idea here is, “Thou hast made room for my feet, so that I have been enabled to walk without hindrance or obstruction. So in Psalms 31:8, “Thou hast set my feet in a large room.” The idea is, that he was before straitened, compressed, hindered in his goings, but that now all obstacles had been taken out of the way, and he could walk freely.That my feet did not slip - Margin, mine ancles. The Hebrew word here rendered in the text feet, and in the margin... read more