As several people have said, life goes on.

Do not feel sad that they are gone, but be glad that you could be blessed to know them, and to be their friend. It is not good, nor healthy to constantly be depressed and sad about the happenings of life. You must count your blessings, and know that you have learned from them something, and that their memories will live on.

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If the world is to be destroyed, so be it. If my fate is to die, I must simply laugh.