Proverbs 4:23
We guard our hearts by guarding our minds, by refusing every thought that is impure, unkind, offensive, unjust, evil, detrimental, or envious. I love to sing Proverbs 18:10: The Name of The Lord is a strong tower: the righteous run into, and is safe. When we run to Him, then with His conscious Presence we maintain our position of victory and we resist the devil.