Short idea (84): If we make an analogy between the Imagination, Sensation, Need, and Thinking on the one hand and four rivers on the other, then there is a place where the rivers merge with each other and eventually form an ocean. Or, we can start with the idea of an ocean and picture the Imagination, Sensation, Need, and Thinking as four rivers that separate and flow out of it. — Without the ocean and its rivers we would all be dead. On the other hand, people often get swept away and drown in one of them. It's naive to forget the dangers of the rivers and the ocean and equally naive (and even fanatically suicidal) to try to get rid of them.