Love seeks no cause nor end but itself. Its fruit is its activity. I love because I love, I love that I may love. Love is a mighty thing, if it so returns to its own principle and origin, if it flows back to its source and ever draws anew whence it may flow again. Love is the only one of all the senses, movements, and affections of the soul, by which the creature can answer to its creator and repay like with like.[1]

[1] Bernard, In Cantica, LXXXIII, cited in Christopher Dawson, Medieval Essays, The Works of Christopher Dawson. Edited by Don. J. Briel Washington D.C.: Catholic University of America Press, p. 92