The best way for a homeless person to know that the train is heading west is to see that it is already going west. He can have various theories about the train, but the most fundamental question is: which direction is it going? Then, he just needs to get on the train that is going in that direction. He just has to go with the flow, conform to the obvious things, and drift with the current, without the need for pointless resistance. #交易哲学