Proverbs 4:23 KJV — Keep thy heart with all diligence; for out of it are the issues of life.
Keep your heart secure, like a vault or th3 compound of the Pentagon.
Nobody can just wander in, or show up unannounced and be given access. You need to have the appropriate security clearance in order to gain access to the facility.
It’s the same with your heart (mind + will +emotions).
The “excessive” security is because of the far-reaching impact that your heart has on everything in creation.