We are in a position now to see the duality in the Christian idea of sacrament, corresponding to the duality – discussed earlier – in the Christian idea of the world. On the one hand, sacrament is rooted in the nature of the world as created by God: it is always a restoration of the original pattern of things. On the other hand, it is rooted in Christ personally. Only through the perfect man can the broken priesthood of humanity be restored. Only through Him can the dark, primordial ocean become the living waters of baptism.
Only by way of His cross can the dead world come to new life. Our task remains, but He has gone before, doing the hard work for us. If we kneel to pray, to adore, to offer our lives, we are only attaching ourselves and assenting to His own similar but all-embracing act.
(Alexander Schmemann, Church, World, Mission, p. 225)