That's a central part of philosophy, of ethics. What do I owe to strangers? What do I owe to my family? What is it to live a good life? Those are questions which we face as individuals.

Sometimes we know the best thing to do, but fail to do it. New year's resolutions are often like that. We make resolutions because we know it would be better for us to lose weight, or get fit, or spend more time with our children. The problem is that a resolution is generally easier to break than it is to keep.

When diamonds' role in fuelling violent conflict in Africa gained worldwide attention, the diamond industry established the Kimberley process in order to keep ""blood diamonds"" out of international trade.

I'm not overly alarmist about it, but I do think there are some worrying signs, like the growing accumulation of wealth by a very small proportion of the population, plus elections in the US are much more dominated by money than anywhere else calling itself a democracy.

I teach kids to read on a Saturday for this charity called Real Action. It's a voluntary school because lots of the kids around my area of London are from immigrant families and need extra help with reading.

Higher education must lead the march back to the fundamentals of human relationships, to the old discovery that is ever new, that man does not live by bread alone.

Do I dare set forth here the most important, the most useful rule of all education? It is not to save time, but to squander it.

I couldn't run a tight schedule, and if you're any good at teaching, you get sucked dry because you like your students and you're trying to help them, but you don't have any time left to write yourself.