Life.
If everything was stable then there would be no fun no gamble nothing.
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Imagine you life without any downs and only ups. Your excitement will not be as much as it should be. You'll be use to your easy life and goals. Real fun would be when you rise from a dip.
The idea is you should just keep going keep fighting. Life is a gamble, keep playing it. You will lose someday and win the other days.