Whatever affects your heart affects your life. Proverbs 4:23. So once the devil knows that this or that will affect your heart, he will then touch it. So the best way to live is to be moved by nothing but God's word. If you are moved when your car has difficulty, he will ensure that your car keeps having fault but when nothing moves you then you are up for victory at all times. That issue taking your joy is turned to a testimony.