In Proverbs 4 the author gives instruction to sons by remembering the instruction his father gave him. His father told him to seek wisdom and understanding and these would bring blessing. He also warns him to stay away from the wicked. He also instructs him to watch or guard his heart with all diligence, for from it flow the springs of life. The statement “with all diligence” is so important here. It denotes the fact that if you let your guard down for a second, something can creep in and bring destruction. Lord, empower me to watch over my heart with all diligence, so that Your life will be seen in me.
– Bryan McKenzie