We can take suffering to be an opportunity to learn and to grow. But if we are honest, we should remember that this is making the best of a bad job, and that minimising suffering takes priority over optimising its outcome.

Once Steve Fuller said that there is this idea that your responsibility as an intellectual is just to speak the truth as you see it. But actually, you should be more appreciative of what needs to be said. I don't think that's ever an excuse to say something you don't believe is true - but sometimes the emphasis has to be different. Well, if I'm talking to an audience of hardline atheists, I'll be trying to unsettle them a bit more, whereas, if I'm speaking to an audience of believers, I'll be giving them more of the pros of atheism. It's about having a sensitivity to context.

There have been a number of philosophers who have reveled in the dismantling of truth. I think they did so with good ethical motives, and for good philosophical reasons. I can see the sense in what they were talking about; the idea that truth is often claimed by elites in order to further certain agendas. They crowd-out alternative perspectives - particularly those of the powerless. But the undermining of truth contributed - in the weird, indirect way that philosophy contributes to the culture - to a rejection of the idea of truth as having any kind of proper meaning at all.

Atheists should point out that life without God can be meaningful, moral and happy.

When you try to translate any kind of real-life problem into a neat logical form, you're almost always simplifying it. We need a kind of blend - we need to use not just tools of logic, which are important and valuable - I'm not denying that, but also tools of judgement, and of inductive and abductive reasoning which can also inform.

The optimist underestimates how difficult it is to achieve real change, believing that anything is possible and it's possible now. Only by confronting head-on the reality that all progress is going to be obstructed by vested interests and corrupted by human venality can we create realistic programmes that actually have a chance of success.

The border between the natural and the supernatural, religion and philosophy, may not always be clear. But there are lines and we should know and accept which side of it we are on.