If you are still mourning and blaming
yourself it is not because God is blaming
you; He has put the blame on Jesus. It can
only be due to one of two things. Either
that you have not really repented, or, more
likely, you are mourning over your lost
righteousness. Perhaps you feel that, having
been saved for so long, you should not
be failing as you are. . . . You are in effect
saying, “Alas for my lost righteousness.”
That is nothing but pride.

Excerpt from the book " When we have failed, what's next?"

" All of us have become like one who is unclean,
and all our righteous acts are like filthy rags;
we all shrivel up like a leaf,
and like the wind our sins sweep us away. "

Isaiah 64:6

As seen from the passage, all our righteous acts are like filthy rags? Why then are we still holding on to the fact that we can, by ourselves, be righteous? The first step to righteousness is recognising that there is nothing righteous about our self... Another paradox of our faith... On a side note... there are many paradoxes in our faith... The greatest amoung you is the least, many who are first are last, many who are last are first, to lose yourself is to find it... those who humble yourself will be exalted... and so on and so forth... okay back to the main topic...

The author then goes on to sum it up using the verse in Philippians 3:8-9, a famous line by Paul:

"I consider everything a loss compared to
the surpassing greatness of knowing Christ
Jesus my Lord, for whose sake I have lost
all things. I consider them rubbish, that
I may gain Christ and be found in him,
not having a righteousness of my own
that comes from the law, but that which
is through faith in Christ—the righteousness
that comes from God and is by faith"