Last month, Sheryl Sandberg's husband, Dave Goldberg, suddenly died in an accident while on a family holiday in Mexico.

Now the COO of Facebook has opened up about her grief, her mourning process and the best way to communicate with someone who has lost a loved one in a moving and heartfelt post on the social network.

"Today is the end of sheloshim for my beloved husband—the first thirty days," began Sandberg's letter. "A childhood friend of mine who is now a rabbi recently told me that the most powerful one-line prayer he has ever read is: “Let me not die while I am still alive.” I would have never understood that prayer before losing Dave. Now I do."

Goldberg, 47, was CEO of SurveyMonkey and died from a head injury sustained after falling off a treadmill at a private villa near Puerto Vallarta, Mexico.

"I think when tragedy occurs, it presents a choice," continued Sandberg, 45. "You can give in to the void, the emptiness that fills your heart, your lungs, constricts your ability to think or even breathe. Or you can try to find meaning. These past thirty days, I have spent many of my moments lost in that void. And I know that many future moments will be consumed by the vast emptiness as well. But when I can, I want to choose life and meaning."

The mother of two - a son, 10, and a daughter, 8 - said she penned the letter "to give back some of what others have given to me" during her mourning period.

"While the experience of grief is profoundly personal, the bravery of those who have shared their own experiences has helped pull me through...So I am sharing what I have learned in the hope that it helps someone else. In the hope that there can be some meaning from this tragedy."

Read a few of her most touching and inspiring words below.

Sheryl Sandberg pens beautiful essay about grieving the sudden death of her husband "I have lived thirty years in these thirty days"