"This is has just honestly been the most incredible experience of my life," Jack said.
"It's just been so healing and it's just - there is no words to describe it. I just want to thank everyone, the whole team, Guy, all of you, just everyone," he continued, as he promised he'd never give up singing again.
"It's honestly changed my life and I'm never going to stop singing ever again."
Jack, who won Australia's Got Talent in 2011 took a five-year break from the spotlight before appearing on The Voice because he wasn't enjoying it anymore.
Jack wasn't the only star from Guy Sebastian's team who didn't make the grade.
Mitch Paulsen and Chynna Taylor were also cut from the competition after Tuesday night's semis, which means there are none of Guy's team going through to the final round.
Sheldon Riley, from Team Delta, and Lee Harding, from Team George, were also cut.
The final will be a battle between Zeek Power, Diana Rouvas, Jordan Anthony and Daniel Shaw.