Great Philosophers Who Failed at Love

I was in that used book stall I like today. I saw a book called GREAT PHILOSOPHERS WHO FAILED AT LOVE. Ha ha ha! I don't know why that made me laugh. And then I saw a book called THE HEAVENLY CITY OF THE 18TH-CENTURY PHILOSOPHERS but at first I thought it said THE HEAVYSET 18TH-CENTURY PHILOSOPHERS. Whew! Anyway, that was some day I had.