Philippians 3:4-6
If anyone else thinks he may have confidence in the flesh, I more so: circumcised the eighth day, of the stock of Israel, of the tribe of Benjamin, a Hebrew of the Hebrews; concerning the law, a Pharisee; concerning zeal, persecuting the church; concerning the righteousness which is in the law, blameless.

Paul did everything right, according to the Torah.
As a Hebrew, it looked as if his salvation was sealed through his efforts to please God.
He even persecuted those committing blasphemy saying the Messiah had come.
But salvation does not come by who we are or what we do. If it did, Paul has more reason to boast than most of the rest of us.
He was the perfect Hebrew!
Philippians 3:7 But what things were gain to me, these I have counted loss for Christ.
He went on to call many things in his life rubbish.
His righteousness was nothing.
His effort was useless.
His goodness was futile.
Only through Jesus Christ did Paul realize the true nature of salvation.
So if you are counting on sitting down with God on judgment day and telling Him how good you are and how many wonderful things you did – you’d better rethink that strategy.