It is a curious subject of observation and inquiry, whether hatred and love be not the same thing at the 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 life upon another; each leaves the passionate lover, or the no less passionate hater, forlorn and desolate by the withdrawal of his object. 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.

Nathaniel Hawthorne