Summary: The devil will do everything in his power to assassinate you and keep you from reaching that expected end (Destiny). He wants to assassinate you. You must guard your heart from the attack of the enemy.
Pastor M.L. Maughmer, Jr.
OPENING:- When I was in the U.S. Army I remember we had to pull guard duty manytimes. The purpose of guard duty was to ensure that either, other soldiers, equipment, or areas were protected from the enemy. I can recall that in basic training or boot camp we had to memorize 3 General Orders and the first one was I will guard everything within the limits of my post and quit my post only when properly relieved. This general order stated that my purpose was to make sure I did everything within my power to protect my post and that I could not quit or stop guarding my post unless I was properly relived. When we were properly relived there was a password that was spoken between the person on guard duty and the one that was reliving them. If the improper password was given you were not properly relived. The safety of all that was being guarded depended upon you the person on guard duty. If something went wrong or the enemy was able to get access into that which you were responsible for guarding, then you were held accountable and punishment was inevitable.
n our text the Bible says Proverbs 4:23 (quickview)  “Keep thy heart with all diligence; for out of it [are] the issues of life”. The word keep is better translated as "guard – which means to keep watch."
It is imperative that we guard our hearts from the attack of the enemy. Ephesians 6:12 (quickview)  says “For we wrestle not against flesh and blood, but against principalities, against powers, against the rulers of the darkness of this world, against spiritual wickedness in high [places]”.
What is Spiritual Warfare?
Understand that the term Spiritual Warfare is not found in the Bible; however, the concept of spiritual warfare is taught because the things that we fight against are of a spiritual nature. To generalize the term of Spiritual warfare is an aggressively active approach to resist the devil, to raze his kingdom and all enemies of God. Spiritual warfare is the trials, tribulation, and storms that come into our lives, which causes faith to be reinforced and released and demonstrates the power of God to a world that is blinded. Spiritual warfare in the life of a true Christian will do as the Bible says in 2nd Peter 1:5-7 “And beside this, giving all diligence, add to your faith virtue; and to virtue knowledge; And to knowledge temperance; and to temperance patience; and to patience godliness; And to godliness brotherly kindness; and to brotherly kindness charity.” It causes a Christian to become more and more rooted and grounded in God, to achieve another level spiritually, and to become a mature spiritual Christian. However, if you do not understand the weapons that the enemy uses then you will not be able to defeat the enemy but fall victim to them.
Proverbs 4:23 (quickview)  “Keep thy heart with all diligence; for out of it [are] the issues of life”. This is advice to protect us in spiritual warfare. Why:- because one the heart is the seat of your desires, you can never truly do something if your heart is not in it. The heart in the physical is what pumps the blood, which is the life source to all other parts of the body. If the heart fails the body dies.