It seems natural for man to experience the world as opaque, and not shot through with the presence of God. It seems natural not to live a life of thanksgiving for God’s gift of a world.
…The natural dependence of man upon the world was intended to be transformed constantly into communion with God in whom is all life. Man was to be the priest of a eucharist, offering the world to God, and in this offering he was to receive the gift of life. But in the fallen world man does not have the priestly power to do this. His dependence on the world becomes a closed circuit, and his love is deviated from its true direction. He still loves, he is still hungry. He knows he is dependent on that which is beyond him. But his love and his dependence refer only to the world in itself. He does not know that breathing can be communion with God. He does not realize that to eat can be to receive life from God in more than its physical sense.
…The world is meaningful only when it is the “sacrament” of God’s presence. …For one who thinks food in itself is the source of life, eating is communion with the dying world, it is communion with death. Food itself is dead, it is life that has died and it must be kept in refrigerators like a corpse.
For the wages of sin is death” The life man chose was only the appearance of life. God showed him that he himself had decided to eat bread in a way that would simply return him to the ground from which both he and the bread had been taken…. [Man] ceased to be the priest of the world and became its slave.
From chapter one in For the Life of the World by Alexander Schmemann (16-17).