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One of the survivors of the Boston Marathon bombing in 2013 is sending the victims of Sunday's shooting in Las Vegas an emotional message of encouragement.

“To those who lost friends and loved ones — I'm so sorry,” Jeff Bauman, who lost both his legs in 2013, wrote on Facebook. “I know there are no words that can bring comfort, but please know that the world is behind you.”

From the 32nd floor of the Mandalay Bay Resort, 64-year-old Stephen Paddock opened fire on a crowd of 22,000 people gathered for a country music festival late Sunday night. The gunman murdered at least 59 people and injured more than 500 others before killing himself.

“To the victims waking up in a hospital right now wondering how life will ever be the same... I know your pain,” Bauman wrote. “The most important advice I can give is to remember that healing your mind is just as important as healing your physical, visible injuries.”

The bombing survivor, who's being played by actor Jake Gyllenhaal in the new movie “Stronger,” admitted it took him “many years and dark moments” to realize the importance of emotional healing.

Desiree Navarro/Getty Images

But it does get better, Bauman encouraged.

“You will walk again. You will laugh again. You will dance again. You will live again,” he wrote.

And during an appearance Tuesday on NBC's “Megyn Kelly Today,” Bauman encouraged those recovering from tragedy to “use your support group around you.”

“I isolated a lot and pushed people away from me that were trying to help,” he said, “so I would just recommend that you don't isolate and that you work on both your physical and mental recovery.”

Watch Bauman's appearance on NBC below.