Sharing faith in Christ has to do with sharing the good which Christ is endeavoring to implant in us. It has to do with sharing the love of Christ with each other through how we interact with each other. This is the ultimate in sharing our faith. It is sharing this living aspect of our faith as it impacts our relationships with each other. His faith has strengthened the entire Christian community in Colossae.
Faith grows as a living faith is shared.
If you want to know what it means to be forgiven, forgive as you have been forgiven. Your faith in God's forgiveness will grow as you share that forgiveness with others. Try to imagine what Philemon is thinking as he hears the letter to the Colossian church read and then reflects on the personal matter Paul addresses in the personal letter he received from Paul. Now he is being called upon to share his faith as he exemplifies the attitude of Christ toward this runaway slave. Problems are solved when we refuse to make demands of others.