Love is difficult to sustain, not because it is a positive emotion, but because it is a complex one. Hate is easy to maintain for a lifetime because it is a simple one. Love might be compared to the building of a tall and elaborate sandcastle, taking many hours of painstaking effort, cooperation, balance, and persistence; and hate might be compared to the foot that comes along and with one vicious or thoughtless kick destroys in a moment what has been built up.
Sydney J. Harris (1917-1986)