“Be angry, and do not sin: do not let the sun go down on your wrath, nor give place to the devil” Eph 4:26-27 (NKJV).  Certain actions give the Devil an opportunity to get his foot in the door.  Anger, bitterness, malice, wrath, lying and hating all give him an occasion to cause havoc.  Do not give the opportunist an opportunity, a place to work, nor territory that he might take.  Stay alert!  Be prayerful!  Keep your soul tender toward your fellow humans and obedient toward your Father.