After more than a decade of writing life-changing advice, I know when to move on. Here’s what else I learned: “In the very first installment of my column for the Guardian’s Weekend magazine, a dizzying number of years ago now, I wrote that it would continue until I had discovered the secret of human happiness, whereupon it would cease. Typically for me, back then, this was a case of facetiousness disguising earnestness…Writing a column provided the perfect cover for such otherwise embarrassing fare. I hoped I’d help others too, of course, but I was totally unprepared for how companionable the journey would feel: while I’ve occasionally received requests for help with people’s personal problems, my inbox has mainly been filled with ideas, life stories, quotations and book recommendations from readers often far wiser than me…For all that: thank you…I am drawing a line today not because I have uncovered all the answers, but because I have a powerful hunch that the moment is right to do so. If nothing else, I hope I’ve acquired sufficient self-knowledge to know when it’s time to move on. So what did I learn? What follows isn’t intended as an exhaustive summary. But these are the principles that surfaced again and again, and that now seem to me most useful for navigating times as baffling and stress-inducing as ours…”