I wrote 'The Spy Who Came in from the Cold' at the age of 30 under intense, unshared personal stress and in extreme privacy. As an intelligence officer in the guise of a junior diplomat at the British Embassy in Bonn, I was a secret to my colleagues, and much of the time to myself.

Success unshared is failure.

Happiness quite unshared can scarcely be called happiness - it has no taste.

Happiness quite unshared can scarcely be called happiness; it has no taste.