For about five months now, two lines of Rudyard Kipling's poem “If” have been going around my head: “If you can trust yourself when all men doubt you, / But make allowance for their doubting too.” The climax of the poem states that if you can indeed do this (and a dozen other things), then “Yours is the Earth and everything that's in it, / And - which is more - you'll be a Man, my son!”