“…because we are human beings, bearing flesh and weakness, and pollute ourselves with many sins, God has given us various sacrifices unto the remission of our sins. If we offer these sacrifices to Him, they purify us in order that we may approach the Mysteries. Merciful almsgiving is a sacrifice which cleanses man from sins. There is also another sacrifice which is unto salvation and the remission of sins, concerning which the Prophet David says, “A sacrifice unto God is a broken spirit; a heart that is broken and humbled God will not despise” (Ps. 50: 17).”
(St. Anastasios of Antioch quote in mystagogy.com)
 

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