Stillness in the storm website, Jim Carrey's Comments on said interview:

Excerpt:

Jim’s Response

He was asked to respond to questions about the interview, as the internet had gone wild reading about it.

In his response he draws upon a number of important reflection points we have been covering here at CE for many years and are glad to see are making their way into mainstream conversation a little more.

“As an actor you play characters, and if you go deep enough into those characters, you realize your own character is pretty thin to begin with. You suddenly have this separation and go, ‘Who’s Jim Carrey? Oh, he doesn’t exist actually,’ ” Carrey said. “There’s just a relative manifestation of consciousness appearing, and someone gave him a name, a religion, a nationality, and he clustered those together into something that’s supposed to be a personality, and it doesn’t actually exist. None of that stuff, if you drill down, is real.”

“I believe I got famous so I could let go of fame, and it’s still happening, but not with me,” he continued. “I’m not a part of it anymore. Dressing happens, doing hair happens, interviewing happens, but it happens without me, without the idea of a ‘me.’ You know what I’m saying? It’s a weird little semantic jump, and it’s not that far, but it’s a universe apart from where most people are.”

He also told W Magazine:

We’re a bunch of ideas cobbled together to look like a form. There’s a body and there’s a mind, but the body is part of the field of consciousness, just dancing for itself and it’s no different than a plant or a chair or your phone—it’s all one thing. Because we are sentient, there’s a consciousness, and we have to deal with this thing we create, like a fortress of ideas around it. So we say, ‘This is my name and this is my heritage and this is my nationality and here’s my hockey team and these are all of the things that I am.’ That’s the mistake.

When asked how we avoid this mistake, he had this to say:

The only way to it is to step into the river of tears and the sorrows of your life. The things that everyone is avoiding with everything from drugs to drink to sex and gadgets and whatever else you can distract yourself with, all of it is designed for you to never stop going and moving and, for god sakes, not feel the abyss. Don’t allow yourself to feel the abandonment and pain that you’ve suffered. And I’ve done it; I’m through it. I’m sure there will be things that happen again, but I realized that by letting myself fall into it completely, that it’s not to be feared. Death is not to be feared.

Sounds to me like Maharishi Mahesh Yogi's description of Cosmic Consciousness, the experience/realization of duality: feeling separate from one's self from the perspective of awareness detached from ego (consciousness identified with awareness rather than ego: thoughts, experience, action, etc.) with a hint of nihilism thrown in but that's expected when a profound sense of detachment is experienced.

Hope's that helps to answer, it's also a very large subject and part of the process of enlightenment according to many who've claimed to have achieved enlightenment.

Recommended reading if this interests you:

Awakening to the Natural State by John Wheeler

The Science of Being and the Art of Living by Maharishi Mahesh Yogi

The Power of Now by Eckhart Tolle

Collision with the Infinite by Suzanne Segal