1 If you have any encouragement from being united with Christ, if any comfort from his love, if any fellowship with the Spirit, if any tenderness and compassion,
2 then make my joy complete by being like-minded, having the same love, being one in spirit and purpose. (Phil.2:1-2)

Ap.Paul experienced much difficulties in his life. But he always was filled with His joy, he was rich with His love. But also he writing to Philipians that if they have any encouragement from being united with Christ, if they have any comfort from his love(AGAPE), if any fellowship with the Holy Spirit, if any tenderness and compassion then make my joy complete... When we His followers have His love and joy and fellowship with the Holy Spirit, and tenderness and compassion then we through Him can make others joy complete. :)