The wonderful little book is called "On Being Nice" and this is how it ends:
"Friendship begins, and loneliness can end, when we cease trying to impress, have the courage to step outside our safety zones and can dare, for a time, to look a little ridiculous."
The last time I was in London I made it a point to visit the store which can be found on 70 Marchmont St, Kings Cross. I can recommend very highly dropping by and seeing for yourself the interesting material they have to offer.
Be sure to visit the The School of Life website.