“Let your mind be deeply impressed with an apprehension of the evil nature and effects of an unsubmissive and restless temper.  It grieves the Spirit of God and induces his departure.  His gracious presence and influence are enjoyed only where peace and quiet submission prevail.  The indulgence of such a temper gives the adversary an advantage.  Satan is an angry and discontented spirit.”  (John Flavel;  1628-1691)