When I was reading the dialogue Parmenides , Plato explores a profound puzzle about the nature of time. The argument can be understood this way: Imagine time divided into three parts: the Past, the Present, and the Future. The Past is what used to exist but no longer does. It is non-existent. The Future is what is yet to exist but does not exist now. It is also non-existent. The Present is the only part that is “real,” yet it seems to be just a boundary dividing the non-existent past from the non-existent future. This raises a question: If the present is only a boundary between two things that do not exist, how thick is it? It is interesting to think that at some point in the past, time began and continues until it reaches its end in the future. The point of this paradox is that the present is the only truly existing thing we experience. We spend more time thinking about the future than living the moment—outcome-centric rather than process-centric. Excessive pessimism toward the futur...