What God seeks from me is something entirely spiritual.  The sacrifice that He wants is a sacrifice of the heart.  The Lord loves mercy and truth, and mercy us not do much an expression of love as it is an act of sacrifice, since it calls of me to sacrifice, not something I think I need to give up for God, but to surrender my very self; to make of my self an offering.

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Elder Aemilianos of Simonopetra

Psalms and the Life of Faith