Quote from : The Scarlet Letter Book

It is a curious subject of observation and inquiry, whether hatred and love be not the same thing at bottom. Each, in its utmost development, supposes a high degree of intimacy and heart-knowledge; each renders one individual dependent for the food of his affections and spiritual fife upon another: each leaves the passionate lover, or the no less passionate hater, forlorn and desolate by the withdrawal of his subject. Philosophically considered, therefore, the two passions seem essentially the same, except that one happens to be seen in a celestial radiance, and the other in a dusky and lurid glow.