Life is difficult, and complicated, and beyond anyone's total control, and the humility to know that will enable you to survive its vicissitudes.
Now you might think that I chose my second theme, the importance of imagination, because of the part it played in rebuilding my life, but that is not wholly so.
Though I personally will defend the value of bedtime stories to my last gasp, I have learned to value imagination in a much broader sense.
Imagination is not only the uniquely human capacity to envision that which is not, and therefore the fount of all invention and innovation.
In its arguably most transformative and revelatory capacity, it is the power that enables us to empathise with humans whose experiences we have never shared.
One of the greatest formative experiences of my life preceded Harry Potter, though it informed much of what I subsequently wrote in those books.
This revelation came in the form of one of my earliest day jobs.
Though I was sloping off to write stories during my lunch hours, I paid the rent in my early 20s by working at the African research department at Amnesty International's headquarters in London.
There in my little office I read hastily scribbled letters smuggled out of totalitarian regimes by men and women who were risking imprisonment to inform the outside world of what was happening to them.
I saw photographs of those who had disappeared without trace, sent to Amnesty by their desperate families and friends.