"An open heart realizes that the human heart is sad when it is genuine. Early American blues and Spanish flamenco---songs of love and separation of any time and place---reveal a sadness that is less an expression of depression or misery than of the depth of the human heart. In the best of these songs there is always something timeless and beyond the personal drama. It rings true to us, and we feel glad. The root of the word sad is the Latin satis, which is also the root of the word satisfied. So sadness is related to being completely full, completely satisfied."