If optimism is important, it's because many outcomes are determined by how much of it we bring to the task. It is an important ingredient of success. This flies in the face of the elite view that talent is the primary requirement of a good life, but in many cases the difference between success and failure is determined by nothing more than our sense of what is possible and the energy we can muster to convince others of our due. We might be doomed not by a lack of skill, but by an absence of hope!

You need a long hard day's work to reveal the logic of the craving for very bad tv and alcohol.

When I see someone like Richard Dawkins, I see my father. I grew up with that. I'm basically the child of Richard Dawkins.

Our minds are susceptible to the influence of external voices telling us what we require to be satisfied, voices that may drown out the faint sounds emitted by our souls and distract us from the careful, arduous task of accurately naming our priorities.

I am conscious of trying to stretch the boundaries of non-fiction writing. It's always surprised me how little attention many non-fiction writers pay to the formal aspects of their work.

Perhaps the easiest people to fall in love with are those about whom we know nothing. Romances are never as pure as those we imagine during long train journeys, as we secretly contemplate a beautiful person who is gazing out of the window – a perfect love story interrupted only when the beloved looks back into the carriage and starts up a dull conversation about the excessive price of the on-board sandwiches with a neighbour or blows her nose aggressively into a handkerchief.

We depend on our surroundings obliquely to embody the moods and ideas we respect and then to remind us of them. We look to our buildings to hold us, like a kind of psychological mould, to a helpful vision of ourselves. We arrange around us material forms which communicate to us what we need — but are at constant risk of forgetting what we need — within. We turn to wallpaper, benches, paintings and streets to staunch the disappearance of our true selves.