Proverbs 28:1 (ESV)
The wicked flee when no one pursues, but the righteous are bold as a lion.
The righteous are bold as a lion - not because THEY are strong, rich, powerful, attractive or accepted by many - the righteous are bold as a Lion because they believe in and rely in the Truth of who Jesus is - The True King of all. The Lion of the tribe of Judah against who none can oppose.
They are bold because their righteousness is not their own but comes from their faith in Jesus and His complete work of redemption on the cross and the empty tomb.
They are bold because what and who they rely and build their life on is not from this world of shifting sands but is the rock that is Jesus Christ - which can never be moved, changed or assaulted.