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 life upon another; each leaves the passionate lover, or the no less passionate hater, forlorn and desolate by the withdrawal of his object.

Nathaniel Hawthorne (1804-1864) American writer

The Scarlet Letter, ch. 14 “Conclusion” (1850)