I would say that it is different for all of us, but that it happens when we grow up, when we mature and pass from the childishness of our youthful tears, and become adults. I think that it is a part of growing up, learning to control our suffering. I think that when we grow up, and learn that happiness is rare, and passes quickly, we become disillusioned and hurt. And how much we suffer is a mark of how much we have been hurt by this realisation. Suffering, you see, is a kind of anger. We rage against the unfairness, the injustice of our sad and sorry lot. And this boiling resentment, you see, this anger, is what we call suffering. It is also what leads us to the hero curse, I might add.