Professor Stephen Hawking is the former Lucasian Professor of Mathematics at the University of Cambridge and author of ‘A Brief History of Time‘ which was an international bestseller.

Let’s look at some of his most inspirational quotes.

1. “Intelligence is the ability to adapt to change.”

2. “The downside of my celebrity is that I cannot go anywhere in the world without being recognized. It is not enough for me to wear dark sunglasses and a wig. The wheelchair gives me away.”

3. “My advice to other disabled people would be, concentrate on things your disability doesn’t prevent you doing well, and don’t regret the things it interferes with. Don’t be disabled in spirit, as well as physically.”

See also: 27 Inspiring and Motivational Leadership Quotes

4. “It is no good getting furious if you get stuck. What I do is keep thinking about the problem but work on something else. Sometimes it is years before I see the way forward. In the case of information loss and black holes, it was 29 years.”

5. “I am just a child who has never grown up. I still keep asking these ‘how’ and ‘why’ questions. Occasionally, I find an answer.”

6. “If I had to choose a superhero to be, I would pick Superman. He’s everything that I’m not.”

7. “Some people would claim that things like love, joy and beauty belong to a different category from science and can’t be described in scientific terms, but I think they can now be explained by the theory of evolution.”

8. “Try to make sense of what you see and wonder about what makes the universe exist. Be curious, and however difficult life may seem, there is always something you can do, and succeed at. It matters that you don’t just give up.”

9. “It is a waste of time to be angry about my disability. One has to get on with life and I haven’t done badly. People won’t have time for you if you are always angry or complaining.”

10. “Keeping an active mind has been vital to my survival, as has been maintaining a sense of humor.”