There's an old proverb which says: "If you live by the sword you die by the sword." Unfortunately, that doesn't hold true for some very callous gun and knife wielding murderers, while many law abiding and peaceful citizens, who DON'T live by the sword, die by the sword.
However, when the proverb is applied spiritually, it's meaning changes dramatically. The Spirit takes the "s" out of sword, which leaves WORD! This WORD is "Sharper than any two-edged sword" (Hebrews 4:12)!
So, if you live by THIS "sword" which is the Word of God, you'll live forever. Then you can make these words of Jesus your own: "Do not be afraid of those who kill the body but cannot kill the soul. Rather, be afraid of the One who can destroy both soul and body in hell." (Matthew 10:28)