I think it all comes down to motivation. If you really want to do something, you will work hard for it.

I was incredibly stubborn. I mean, I believe that my father was frequently in the right, but I would never admit it, and so we did have a few set-tos on various topics; but on the whole as I got older and my father got more mature we got along reasonably well.

No one remembers who climbed Mount Everest the second time.

I would have said that during the early days of my life there was never a moment when I wasn't fit. We worked extremely hard on the beekeeping line, and both my brother and I used to compete, particularly when we were collecting honey. We would each have an 80-pound box of honey and we would race up the hill on the Tuakau track and race back down. We just raced all the time, and we used to keep very fit indeed.

We had so much in common [with June Hillary] that we just carried on with life as we had been doing. It wasn't easy, but it was - I realise now that it was the only thing to do.

I think global warming is a very real problem for our world. I've seen the changes that have taken place in the Antarctic, in the Himalayas, where the natural ice has sort of faded away, and there's no doubt in my mind that we're living in a strange world, a world which is not easy to understand or handle, But there's nothing you can do about, you just have to live your life as best you can.

I think I mainly climb mountains because I get a great deal of enjoyment out of it. I never attempt to analyze these things too thoroughly, but I think that all mountaineers do get a great deal of satisfaction out of overcoming some challenge which they think is very difficult for them, or which perhaps may be a little dangerous.