John Trapp on Psalms 17:11

Verſ. 11. They have now compaſſed us in our ſteps] i.e. Me and my company; ſo that we cannot ſtir any whither but we are in danger of them. In all thy ways acknowledge God, and he ſhall direct thy paths, Prov. 3.6. Commit thy way unto the Lord, truſt alſo in him, &c. Pſal. 37.5. Keep within Gods Precincts, and thou ſhalt be under his protection. He took order that a Bird ſhould be ſafe upon her own Neſt.

They have ſet their eyes bowing down to the earth] i.e. Hoc unum ſpectant ut ruamus, Junius; They are earneſtly bent, and firmly reſolved upon our ruine, as one that fixeth his eyes upon another, to mark him, or to know him again; or as Bulls ready to run at one, ſet their eyes downward.