Read Becoming a Writer by Dorothea Brande. Then do what it says, including the tasks you think are impossible. You will particularly hate the advice to write first thing in the morning, but if you can manage it, it might well be the best thing you ever do for yourself. This book is about becoming a writer from the inside out. Many later advice manuals derive from it. You don't ­really need any others, though if you want to boost your confidence, "how to" books seldom do any harm. You can kick-start a whole book with some little writing exercise.

He once thought it himself, that he might die with grief: for his wife, his daughters, his sisters, his father and master the cardinal. But pulse, obdurate, keeps its rhythm. You think you cannot keep breathing, but your ribcage has other ideas, rising and falling, emitting sighs. You must thrive in spite of yourself; and so that you may do it, God takes out your heart of flesh, and gives you a heart of stone.

The fate of peoples is made like this, two men in small rooms. Forget the coronations, the conclaves of cardinals, the pomp and processions. This is how the world changes: a counter pushed across a table, a pen stroke that alters the force of a phrase, a woman's sigh as she passes and leaves on the air a trail of orange flower or rose water; her hand pulling close the bed curtain, the discreet sigh of flesh against flesh.

Fortitude. ... It means fixity of purpose. It means endurance. It means having the strength to live with what constrains you.

When you are writing laws you are testing words to find their utmost power. Like spells, they have to make things happen in the real world, and like spells, they only work if people believe in them.

[Margaret Thatcher] said there was no thing such as society. This is what I find so interesting psychologically. Where did she come from? She had no mother. Her father came from a very identifiable background: religious, highly conformist.

I am not a historian. I don't see what I do as being a rival to biography.