For to me to live is Christ, and to die is gain. 

- Philippians 1:21

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For even in dying, he means, I shall not have died, for I have my life in myself: then would they truly have slain me, had they had power through this fear to cast faith out of my soul. But as long as Christ is with me, even though death overtake me, still I live, and in this present life, not this, but Christ is my life. Since, then, not even in the present life is it so, but that life which I now live in the flesh I live in faith; so I say in that state also, I live, yet not I, but Christ lives in me (Galatians 2:20). Such ought a Christian to be! 

St John Chrysostom, Homily III on Philippians