People, who trust in their religion, point to all the things they have done, and are proud that they have observed the rules.  The Apostle Paul was different.  He knew that he could never achieve favour with God by anything he did; even his previous religious pedigree and fervour had no value to God (Philippians 3:3-7). But he could point to the cross of the Lord Jesus Christ with great confidence; trusting that His death was the atoning sacrifice for his sins (1 John 4:10).  

Paul could boast about how wonderful Jesus is and how great is His salvation; that is praise (Revelation 5:9-14): but he could not boast about his own sinful life; that would be narcissism – a conceited view of himself which bears no relation to reality (Philippians 2:3).  
 
Instead of Christ’s cross being a focus of shame (as the world sees it), Paul saw it as the only route to glory (Hebrews 12:2).  Instead of the world being the opportunity for self-achievement, Paul saw its boasting as eternally hollow (Colossians 2:8).  He saw no value in being alive to its demands, and it saw no value in him. The only thing which mattered to Paul was that, through the death of Jesus Christ, he had been given life.  He had become a new creation (2 Corinthians 5:17).  He had personally experienced peace with God, had received mercy for sins and knew he was accepted into God’s family (1 Timothy 1:15-16).
 
Naturally, we want the world to admire us and congratulate our achievements – including our religious achievements.  But it is a deadly delusion. Jesus said, “Whoever wants to be my disciple must deny themselves and take up their cross and follow me.  For whoever wants to save their life will lose it, but whoever loses their life for me and for the gospel will save it.” (Mark 8:34-35)  If you like to boast about what you have done, then repent and start valuing what Christ has done for you.  It is the only way forward; every other way will fail.  That change of mind will transform your way of life and brighten your eternal horizon (Romans 12:1-2).