The more we see our sins - the more we should value the remedy - confessing to Christ and living rightly.
If we deny our sins, the truth is not in us,
- either the truth that is contrary to such denial (we lie in denying our sin)
- the truth of religion, is not in us.(we are not living according to God's Holy Word, the Bible)
If we say, We have not sinned, we make him a liar, and his word is not in us,
adapted from Matthew Henry's Complete Bible Commentary