Around AD 63-64, Paul wrote a letter of encouragement to the Philippians, referred to as the love letter of joy and of excellent things. He prayed since he was going through the same struggles others were experiencing, if we have any encouragement from being united with Christ, we must find comfort in sharing in the spirit and having the same love, being one in the spirit; not looking to our own interest, but each of us looking to the interest of others.