For he shall give his angels charge over thee, to keep thee in all thy ways (comp. Psalms 34:7). The faithful are under the constant care of angels (Hebrews 1:14), who guide them and direct them perpetually.
Satan made a crafty use of this promise when he tempted our Lord (Matthew 4:6; Luke 4:10, Luke 4:11). No doubt it applies to him pre-eminently, as the specially "Faithful One."