Paul: I think we grossly underestimate our sorrows, in general. We always die of sadness, actually.
Alice: You mean sadness is put inside us at birth?
Alice: Like eye color?
Alice: Exactly. That's why it needs our care, but others can do nothing. No one can do anything about eye color. Also, I think it would be fair to let you take care of your sorrow alone.
Taken from the movie Dans Paris.