I quoted this John Piper sermon in a recent post, but it's so good it deserves another mention. File this under "a good word for the Christian discouraged by his/her sin."
One of the ways that the Spirit testifies--gives you evidence--that you are a child of God is that He leads you into war against your sin...
So, you wanna know if you're a child of God this morning?...
Ask, have I made peace with sin in my life?
Am I at home with it?
And am I content with it?
And do I get along with it just fine?
Or, have I been led by the Spirit to make war on it so that day by day I am putting to death the deeds of the body?
That's how you can know if you're a child of God: how do you feel about the sin in your life?
Do you hate it and make war on it? Or do you like it and make peace with it?