References:

https://www.dummies.com/relationships/happiness/the-four-basic-ingredients-of-happiness/

https://exploringyourmind.com/7-ingredients-of-happiness/

https://www.briantracy.com/blog/personal-success/happy-life-self-improvement-positive-thinking/

https://psychcentral.com/blog/the-4-secret-ingredients-for-a-truly-happy-life/

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