Some, like me, think this is where Paul LIED! I think Paul was perfect the moment God made Him Apostle, so if Paul at any stage say he did not attain perfection yet, then he would not have been appointed as an apostle... but this has deeper meaning!
Philippians 3:12. Not as though I had already attained, either were already perfect: but I follow after, if that I may apprehend that for which also I am apprehended of Christ Jesus.
Then he goes on and say this a few verses later....
Let us therefore, as many as be perfect, be thus minded: and if in any thing ye be otherwise minded, God shall reveal even this unto you.
Now I ask did God have to reveal anything more to Paul? I think not, Paul was a complete GODLY MAN!