AKA- Stay strapped or get clapped. 
In many places and situations these days, physical weapons or tools, are not allowed. If you cannot bring a weapon, be the weapon. Train and learn as many useful things as possible in order to be the most effective. You never know what kind of situation you may find yourself and your loved ones in and should always be prepared anything. 
In the Marine Corps, the motto "One Mind, Any Weapon" that is associated with the MCMAP training program embodies the philosophy that you should be effective not only with specific weapons, but your body and mind by using a combination of mental, physical, and moral discipline.
 
Stay Driven.