Is it not merely thought? Suppose you were born blind and by some miraculous medical procedure your sight was restored an hour ago. Imagine your elation right now. Yet you would be the same person but your evaluation of perspectives or attitude would have drastically changed. In fact you’re much better off as is than if your sight was just restored because you have had the wonder of all of life’s scenery thus far. So what’ll it be, elation or depression? What sort of problems are you allowing to bring down your spirits or gratitude for life? Does the inner or outer determine your happiness? Of which are you in control?