Water comes from its own source which is God. And since God desires to do so … God produces this delight with the greatest peace and quite and sweetness in the very interior part of ourselves. I don’t know from where or how, nor is that happiness and delight experienced, as are earthly consolations, in the heart. I mean there is no simliarity at the beginning, for afterward the delight fills everything; this water overflows through all the dwelling places and faculties until reaching the body. … It begins in God and ends in ourselves.
– Saint Teresa of Avila
from “Interior Castle”