The Gospel: God being involved in our process of making inferences.
Our good works don't make us appear right and holy before God. We tend to feel disgusted towards ourselves when we make mistakes. But then, when we get into the habit of doing good again, our perception towards our standing before God changes. We then feel ACCEPTED. Friends, if this is how we see ourselves, our perception of God is distorted.
If Jesus is in us, how we see ourselves don't matter. How God sees us is the only thing that matters. Sometimes our perception regarding different things gets distorted. The opinions of the world can get included in our process of deducing spiritual truths. Jesus came so that we may know Him who is true. (1 John 5:20) Our knowledge of Him, viz. our knowledge of the truth elevates us from the world's flawed systems of thought. Paul himself said, "I resolved to know nothing except Jesus and Him crucified. " (1 Corinthians 2:2) Having encountered Christ and experienced His unmerited kindness prompted Paul to believe and live this philosophy. For Him, Christ-crucified is the peak of knowledge.
Christ is our righteousness before God. In and of ourselves we've got nothing good to show before a Holy God. If we have put our faith in Christ, it's Christ whom God sees upon looking at us. It's Christ's righteousness, obedience, humility, perfection that He sees. Because we are 'in' Christ, God is pleased with us; because Christ is in us, we've got the power to overcome sin.