Our call to holiness is clearly revealed in the New Testament.   St. Peter tells us, "as he who called you is holy, be holy in all your conduct."   This is clearly a call to action.  At the same time, however, we must realize that holiness is more something done to us-- and in us--than something done by us.  "To be filled with the fullness of God", as St. Paul puts it, is a divine initiative.  This takes great courage and trust on our part, because to be filled with God is also to die once and again to ourselves.  

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