Friday Philosophy

I've been wondering lately why things that used to occupy much of my time, because I enjoyed them so much, so longer seem to have the same effect. Maybe this explanation from Aristotle's (384 BC- 322 BC) Ethics explains that phenomenon:

"How, then, is it that no one is continuously pleased? Is it that we grow weary? Certainly all human beings are incapable of continuous activity. Therefore pleasure also is not continuous; for it accompanies activity. Some things delight us when they are new, but later do so less, for the same reason; for at first the mind is in a state of stimulation and intensely active about them, as people are with respect to their vision when they look hard at a thing, but afterwards our activity is not of this kind, but has grown relaxed; for which reason the pleasure also is dulled."