A true sacrifice is anything that we do with the aim of being united to God in holy fellowship – anything that is directed towards that supreme good and end in which alone we can be truly blessed… as the Latin word indicates: “sacri-ficium,” “holy-doing” or “holy-making.” Man himself can be a sacrifice, if he is consecrated in the name of God, and vowed to God – a sacrifice in so far as he dies to the world in order to live to God.
–Saint Augustine (354-430)