Here's another foundational statement from Renovation of the Heart:
We must clearly understand that there is a rigorous consistency in the human self and its actions. This is one of the things we are most inclined to deceive ourselves about. If I do evil, I am the kind of person who does evil; if I do good, I am the kind of person who does good (1 John 3:7-10). Actions are not impositions on who we are, but are expressions of who we are. They come out of our heart and the inner realities it supervises and interacts with.
Today one of the most common rationalizations of sin or folly is, "Oh, I just blew it." While there is some point to such a remark, it is not the one those who use it hope for. It does not exonerate them. While it may be true that there are other circumstances in which I would not have done the foolish or sinful thing I did, and while what I did may not represent me fully, "blowing it" does represent me fully. I am the kind of person who "blows it." "Blowing it" shows who I am as a person. I am, through and through, in my deepest self, the kind of person who "blows it"—hardly a lovely and promising thing to be.
Whatever my action is comes out of my whole person...
There you go again, Dallas Willard. Not sugar-coating it. Not letting us off the hook. Good intentions are not enough. The will is not strong enough. Because I am sinful, I sin. A bad tree produces bad fruit. But the good news is that my intentions and will—indeed my heart— can be aligned with God and his kingdom (which Willard defines as "the range of God's effective will, where what God wants done is done"). I can be formed into a good tree that bears good fruit. That's the radical-sounding message of this book.
More to come...
Quote from Chapter 2 "The Heart in the System of Human Life"