Contemporary English Version (CEV)
Most people aren't in a big hurry to talk about sin. Sin isn't very popular, especially in an age of doing whatever feels good & right. The popular idea is that if you aren't hurting anyone else, it's ok.
God, however, takes a bit of a different stance on the issue. Scripture teaches us a lot about sin, and it's just as much about what we don't do as it is about what we do. Whenever we turn from God, even if it's just in the very depths of our hearts and we don't say a thing out loud, we sin. We are in constant need of forgiveness, and so we repent, asking God to forgive us and thanking God for the grace freely bestowed upon us.
Humility isn't easy, but it's necessary. We are sinners in need of a Savior, and the God who comes to convict us of our sin is the same God who liberates us from that sin. We are free because of Christ, and so when Christ speaks to us of sin, let us remember that he does so out of love.