What our Lord wants us to present to Him is not goodness, nor honesty, nor endeavor, but real solid sin; that is all He can take from us.  And what does He give in exchange for our sin?  Real solid righteousness.  

From Galatians 2:20:  “And it is no longer I who live, but it is Christ who lives in me.  And the life I now live in the flesh I live by faith in the Son of God, who loved me and gave Himself for me.”