Having found suitable men, our next problem was to keep them and nurture them until they were ready. To do that I had to give them work of significance to do, and not treat them as apprentices. As I allotted them important tasks, some of the old guard became apprehensive for their own positions. They saw no reason why these bright, young, energetic men who had not contributed to the struggle, should come in and displace them before they were ready to go.

Treat writing as a job. Be disciplined. Lots of writers get a bit OCD-ish about this. Graham Greene famously wrote 500 words a day. Jean Plaidy managed 5,000 before lunch, then spent the afternoon answering fan mail. My minimum is 1,000 words a day – which is sometimes easy to achieve, and is sometimes, frankly, like shitting a brick, but I will make myself stay at my desk until I’ve got there, because I know that by doing that I am inching the book forward. Those 1,000 words might well be rubbish – they often are. But then, it is always easier to return to rubbish words at a later date and make them better.

I looked straight across at the clock and I was disappointed with the time. I should have run under 49 and I didn't. And I knew I had a lot more in me.

Of course, the most rewarding part is the "Aha" moment, the excitement of discovery and enjoyment of understanding something new, the feeling of being on top of a hill, and having a clear view. But most of the time, doing mathematics for me is like being on a long hike with no trail and no end in sight! I find discussing mathematics with colleagues of different backgrounds one of the most productive ways of making progress.

No big challenge has ever been solved and no lasting improvement has ever been achieved unless people dare to try something different. Dare to think different.

Fearlessness means taking the first step, even if you don't know where it will take you. It means being driven by a higher purpose rather than by applause.”