We can get caught up in things that are a waste of our energy and though and emotion. We wind up taking care of things, fixing our accounts, making technology work, when there is something more important to use up our time and energy. We get caught up in other people's emotion. They are troubled and so we are troubled. We can spend all our thought defending ourselves or answering people, if only in our minds. Since the fullness of God is in Jesus and we have that fullness, surely there is a better way to focus our attention and use our energy. That is the natural outcome of a life make whole and complete by His fullness. We have the freedom now to focus our attention on things of God, things Jesus is doing, things God has in mind. So we set our minds, we direct them to the One who we have submitted to as our Ruler, our King, our Lord. There is nothing else that makes sense because our lives are hidden with Christ in God. Our attention, our thoughts, our focus all belongs to Him now.
So do our actions. Since our life is in Christ, there are things that don't belong in our lives because they have no place in Christ. We die to things listed in vss. 5-9. It is sometimes a slow death. We have to keep choosing, continue to turn to something better, catch ourselves and repent and start again. But our belief is that we are being given a nature that doesn't act like this anymore. We just have to practice and behave in new ways so that we unlearn our old patterns. We aren't like that anymore and He is helping us become like Him.
We get rid of things that don't belong and practice things that must become more and more a part of us.. Paul describes it a clothing ourselves with compassion & kindness and humility and gentleness and patience. Isn't it amazing the kind of heart and life God would create in us? How did we ever think that the Christian life was about being rule keepers or having a certain place in a community? This life is about making these things that could be called a good heart an integral part of what life is, just like putting on our clothes every day. The most mature Christian is not the one with the most rules, or the one who knows the most facts, but the one who loves the most.
Love binds the whole package of life with God together. Because of that love we can live with the wholeness of peace in our hearts and in our relationships. Since we have this great privilege, we use these relationships to become more and more the people of love God means for us to be. So we encourage and admonish and lift our hearts together to the God who is the author of our love. And every thing we do, we do for Jesus and as if Jesus were doing it. In reality, He is doing what we do through us when we set our minds on things above and our life is hidden with Christ in God.

Colossians 3:1-17