This is my standing up for sadness as a necessary emotion to make us whole and compassionate. Don't mix it with depression, which is a total different thing! But these days it get's mixed up very easily.
Celebrate all of your emotions, they are valuable and help you to get through life. Sadness as well!

Interesting book and one of my sources for neurobiological science:
George A. Bonano: The other side of sadness. 2009

https://www.kleinschnittgercoaching.de