In an interview with Parade, the I Love You Phillip Morris star revealed that he has often bounced between bliss and suffering in his lifetime.
"There's always some sort of deep undercurrent running under things for me," he said.
The actor added: "I've had peaks of kind of enlightenment where I felt like, 'Oh, wow. I've got to figure it out. This is it. OK. I have peace. I have bliss.'
"And then, boom, off the wave, into the surf, and you're struggling again. I definitely have those scared to death moments, but they're what make you interesting."
Carrey also explained that he believes his life's path is up to a higher power.
He explained: "What's important to me is the long haul. It's a strange thing, but sometimes I think that God is somehow fashioning my life so that I do stay interested and stay hungry."
I Love You Phillip Morris is released in US cinemas on December 3.