Why did the lamp go out?
I shaded it with my cloak to save it from the wind, that is why the lamp went out.
Why did the flower fade?
I pressed it to my heart with anxious love, that is why the flower faded.
Why did the stream dry up?
I put a dam across it to have it for my use, that is why the stream dried up.
Why did the harp-string break?
I tried to force a note that was beyond its power, that is why the harp-string is broken.