Decisions in poker must be made on the spur of the moment. You have seconds to make a decision that can possibly cost you a large sum of money or win you an even greater sum of money. You have little time to think about what you will do, and you must size up a number of factors before making a decision.
Players who are sitting at the final table of a tournament should stop thinking about winning pots and start thinking about winning stacks. This is also a pretty good way to approach the start of a tournament as well, but not collecting stacks at that point is not vital. Players who go into heads up play with an overwhelming chip lead will win more often than they will lose. That is why you want your opponent's entire stack instead of just hanging on by winning the odd pot. So part of winning stacks is convincing your opponents to push their entire cache of chips into the center of the table.