Art as Sorrow/Pain

When we were discussing nature as sublime in class on Friday, I was reminded of a quote I once heard about art/nature/beautiful things. I can't remember it exactly but it said something to the effect of: art or other beautiful things (like sunsets, mountain views, etc.) are painful because you want to grasp those moments forever, but you can't. I just really liked that way of thinking about it because I do get some sort of feeling of sorrow or something when I see a beautiful sunset, or a painting that I wish I could stare at for hours. Not quite the same thing as the 'sublime' which is sort of joy and terror mixed together but similar - kind of a mix of joy and nostalgia. Anyway, just something that came to mind.