Quote

"I do not think that this happiness has its source in the heart at all. It arises in a much more interior part, like something of which the springs are very deep; I think this must be the centre of the soul. ... The fragrance it experiences, we might say, is as if in those interior depths there were a brazier on which were cast sweet perfumes; the light cannot be seen, nor the place where it dwells, but the fragrant smoke and the heat penetrate the entire soul, and very often, as I have said, the effects extend even to the body. Observe--and understand me here--that no heat is felt, nor is any fragrance perceived: it is a more delicate thing than that; I only put it in that way so that you may understand it. ... I think I have read that they are like a hedgehog or a tortoise withdrawing into itself ..."

--Teresa of Avila, Interior Castle