If one has a clean conscience and pure heart and loves the Lord, there is really nothing for him to fear. He is ready for the Lord to come at any time. Psalm 27, today's Responsorial Psalm at Mass, starts out: "The Lord is my light and my salvation; whom should I fear? The Lord is my life’s refuge; of whom should I be afraid?"
Now, consider those in the world who are powerful, famous, wealthy, and influential. They appear to be fearless, but will they not cringe when they face the Lord? This is the true test.
If you want to be truly fearless, get the Lord on your side first.