You are the greatest and holiest mystery.
Be all of my love,
all my hope,
all my striving;
let my thoughts and words flow from you,
my daily life be in you,
and every breath I take be of you.
– St John Cassian 360-435AD. Also known as John the Ascetic, or John Cassian the Roman. He learned from Christian monks in Egypt and brought writings and theology of a simple direct and anti-materialist flavour to the wider Christian movement.