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Zelda Williams is speaking out about depression, one year after her father, Robin Williams, took his own life.

The actress took to Instagram on Saturday to share a long message about a particularly "beautiful" day with her friends by a lake, something that led her to a realization she had to share.

"I spent this night shivering and laughing under a clear, cold sky full of stars with people I love just to witness something beautiful. We mooned the moon and laughed ourselves hoarse, and I'm so incredibly grateful for every silly second," she writes. "I came to a realization this year that I feel compelled to share here, for whomsoever may need it: Avoiding fear, sadness or anger is not the same thing as being happy."

"I live my sadness every day, but I don't resent it anymore," she continues. "Instead, I do it now so that the wonderful moments of joy I do find are not in order to forget, but to inhabit and enjoy for their own sake. It's not easy. In fact, I'd say it takes much more effort to consciously do than it does to just stay sad, but with all my heart, I cannot tell you how worth it it is."

She then sends a message straight to those battling depression.

"And for those suffering from depression, I know how dark and endless that tunnel can feel, but if happiness seems impossible to find, please hold on to the possibility of hope, faint though it may be," she writes. "Because I promise you, there're enough nights under the same yellow moon for all of us to share, no matter how or when you find your way there."

The strong message comes a year after her dad committed suicide on August 11, 2014, after battling depression himself.

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