Psalms 18:36 - Joseph Benson’s Commentary on the Old and New Testaments

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 steps, the contrary state of prosperity and plenty. So that David here praises God for advancing him to great honour and prosperity. That my feet did not slip Or stumble, as they are apt to do in narrow and uneven ways.