We now have this light shining in our hearts, but we ourselves are like fragile clay jars containing this great treasure. This makes it clear that our great power is from God, not from ourselves. We are pressed on every side by troubles, but we are not crushed. We are perplexed, but not driven to despair. We are hunted down, but never abandoned by God. We get knocked down, but we are not destroyed. — 2 Corinthians 4:7-9
Every Christian is a vessel God has uniquely created for sharing a treasure with others. This treasure, referred to as the gospel of Jesus, is contained in "fragile clay jars" so it's "clear that our great power is from God, not from ourselves." Paul uses the phrase "fragile clay jars" because as humans we are easily broken and we struggle with the most basic details of life. Yet we are called to pour out our treasure so that the world comes into contact with God.
God's works flow naturally from a person whose life has been totally committed to him. The key is to give liberally of what we've received, knowing that the Lord will continue to fill us so that we are never totally empty nor constantly overflowing. Instead, our container will be full of holes that continuously pour out the love of Jesus. As long as we are being filled by God daily, we will never have a problem serving those he wants us to serve (see Galatians 6:10).
However, these clay jars can eventually become empty from lack of use. Empty vessels serve little purpose other than taking up space. And the Lord does not want us to simply exist. As pastor Rick Warren has correctly noted, each person has been made for a purpose. When a follower of Christ is not connected to the source of these gifts, his or her desire for serving God and other people diminishes.
Think about your life-vessel today. How has it been used to store the goodness of God? Has that goodness flowed into other lives? Has God's measure of goodness in you evaporated from days and months of non-use? Or is your life a container full of holes, leaking the goodness of God continuously because you are continuously filled by the source that never runs dry?