Repentance… means a change of mind! Formerly I thought sin a pleasant thing, but now I have changed my mind about it; formerly I thought the world an attractive place, but now I know better; formerly I regarded it a miserable business to be a Christian, but now I think differently. Once I thought certain things delightful, now I think them vile; once I thought other things were worthless, now I think them most precious. That is a change of mind, and that is repentance. No life can be truly changed apart from such a change of mind.
Watchman Nee
The Normal Christian Life, Tyndale House 1957/1977, 132
GraceQuotes.com 
The BIG change of mind is about our good deeds, not our bad ones. The bad ones have been dealt with by Jesus. He never took our self-righteous acts. You can ask many unsaved people the question: When you meet St Peter at the gates of heaven and he asks why he should let you in, what will you say? Most will say that they tried to be a good person or something of that ilk. That is the change of mind needed to be saved. Stop trusting your good deeds, start trusting Jesus. This is much more a non-grace quote than a grace quote!
Jeremy, I agree with much of what you say. (As usual, I find your ungracious kicks at the end to be ill-suited to this blog, yet I keep publishing them in the hope that you may yet learn to convey grace, not merely talk about it.) But I find it hard to fathom how you would disagree with Mr Nee. Has not your view of sin changed since you have come to put your trust in Jesus and the gift of His righteousness? Whatever is not of faith is sin (Rms 14:23). Formerly I thought of my good works and zeal as profitable. Now I view them as dung. By my actions I showed that I thought His grace meritless. I have since changed my mind! Now I think His grace is most precious. I have put my faith in it and nothing else.