Is pleasure different from fear? Or is fear pleasure? They are like two sides of the same coin when you understand the nature of pleasure, which is also time and thought. You have experienced something very beautiful in the past and it is recorded as memory and you want that pleasure repeated; just as you remember the fear of a past event and want to avoid it. So both are movements of the same kind although you call one pleasure and the other fear.
– Jiddu Krishnamurti. (1982). The Flame of Attention.