When man is serene, the pulse of the heart flows and connects, just as pearls are joined together or like a string of red jade, then one can talk about a healthy heart. – The Yellow Emperor’s Canon of Internal Medicine, 2500 B.C.

Who has not sat, afraid, before his own heart’s curtain? – Rainer Maria Rilke, Duino Elegies, “The Fourth Elegy,” translated from German by

When a watch goes ill, it is not enough to move the hands; you must set the regulator. When a man does ill, it is not enough to alter his handiwork, you must regulate his heart. – Augustus William Hare and Julius Charles Hare, Guesses at Truth, by Two Brothers