08/27/2012 10:12 am ET Updated Dec 06, 2017

WATCH: How To Forgive And Let Go, From Gretchen Rubin

Holding onto hurt from the past can be detrimental to happiness. Gretchen Rubin, author of "The Happiness Project" and "Happier at Home," spoke about the power of forgiveness and the benefits of letting go when we spoke on Mondays With Marlo.

For more fantastic advice on lifting your mood, see Gretchen Rubin's tips on happiness:

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