If you are feeling bad that you:

- Failed at your job.

- Quit a failing business.

- Could not clear an exam.

You should read this quote by Yuval Noah Harari about the Ancient Romans:

"The ancient Romans were used to being defeated. They could lose battles after battles, but still win the war. An empire that can't sustain a blow and remain standing, is not really an empire".

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Now, this is not an excuse for you to fail at everything.

Thoughtful failure and going down fighting is very different from being lazy and not acting at all.