Excerpt from Life Teen’s resource “Ascend: A Companion to the Sunday Mass Readings”:
Imagine what your life would like if you believed everything the Lord said. Imaging how different your life would look if you trusted God like He tells you to do. Consider what an impact it would have on your daily walk if you believed, deep in your heart, how much God really loves you.
Think about how radically different your life would look if you took sin more seriously and lived knowing how deadly it really is to your soul. Pause and ask yourself, if you went to confession more what impact would it have on your joy or your appreciation for God's mercy? God reminds us that we are sinners in need of salvation. He forgives the sin, yes, but also commands us to "go and sin no more." Sin and salvation are really all that matter in life, as we learn from St. Paul. Though we don't deserve God's mercy, who are we to second guess God, as we are reminded in our first reading?
We are all the women caught in adultery, giving ourselves to sin and false lovers, rather than to God and God alone. Just as Jesus saves her, the Lord "has done great things for (all of) us" as we are reminded in the psalm. The question today is not whether or not you have sinned, but what are you going to (let God) do about it?