Jamieson, Fausset & Brown

Faithful--to His covenant promises (Joh 10:27-29; Co1 1:9; Co1 10:23; Phi 1:6). he that calleth you--God, the caller of His people, will cause His calling not to fall short of its designed end. do it--preserve and present you blameless at the coming of Christ (Th1 5:23; Rom 8:30; Pe1 5:10). You must not look at the foes before and behind, on the right hand and on the left, but to God's faithfulness to His promises, God's zeal for His honor, and God's love for those whom He calls.