Thomas Aquinas, on Ps 16:5

“Perfect thou my goings in thy paths: that my footsteps be not moved.”

“Next he determines what he asks: "Perfect my steps in your paths," namely of justice. Job 4: "Where is your strength, your patience, and the perfection of your ways?" And this, so that my footsteps, that is, my affections, may not be moved from your commandments. Or Christ asks for the Church, that her steps be perfected and that her footsteps, that is, her sacraments, not be moved. Likewise, since from actions habits are generated, actions leave footsteps in the will. Or, literally, David asks that he not be hurled down from the precipices over which he passed while fleeing from Saul: 1 Sam. 24: "Saul pursued him over the steepest rocks." Another reading has: "Sustain my steps in my paths, and my footsteps will not slip." Or that Christ, according to his humanity, be perfected forever in the glory of divinity: Jn. 17: "Glorify me, Father, with yourself, with the glory that I had before the world was."”

Imported from an open dataset — not yet checked against the printed edition.