Forgiveness is free to us but infinitely costly to Him. Therefore sin is a big deal and grace a better offer than we could have ever dreamed.
I wonder how often in my own heart (too often, I'll admit) I rely more on my power to confess a sin than I do God, through Christ, to forgive it. As if saying the magical words just makes it go away. There is only one thing that makes it go away, the beauty of Jesus' sacrifice as an acceptable offering unto God that atones for my sin.
The fact that it took Jesus' sacrifice means it's a big deal. The fact that it comes to me freely means it's a great deal. Thank you God for your grace!