David Frost, George Harrison and John Lennon in conversation on 'The Frost Programme', 29 September 1967
David Frost: How do you come to reach this stage of meditation?
George Harrison: Each person's individual life pulsates in a certain rhythm, so they give you a word or a sound, known as a mantra, which pulsates with that rhythm. The whole idea is to transcend to the subtlest level of thought, so you replace the thought with the mantra, and the mantra becomes more and more subtle until finally you've lost even the mantra. Then you find yourself at the level of pure consciousness.
David Frost: Is the mantra something you use to get back to the subject if you find earthly or irrelevant thoughts intruding?
John Lennon: Yes, it's sort of like that. You just sort of sit there and you let your mind go. It doesn't matter what you're thinking about, just let it go, and then you just introduce the mantra or the vibration to take over from the thought. You don't will it, or use your willpower.
George Harrison: We've only been doing it for a matter of six weeks, and there's definite proof I've had that it is something that really works. But in actual fact it'll take a long time to arrive at the point where I'm able to bring that level of consciousness into this level of consciousness, which is the aim of it.
George Harrison and John Lennon interview on the David Frost Programme, 1967 from the book George Harrison Living In the Material World, Page 180