If you try to match the penny some one has covered, and fail ten times
in succession, it is a certainty that you will succeed often enough, ere
long, to make your failures and your successes balance. Everything which
depends entirely on chance is exactly even. If the man you envy to-day
on account of some piece of unquestionably good luck, were to be as
closely watched to-morrow, he would be seen to suffer some piece of as
unquestionably bad luck. You cannot help noticing his good fortune, and
he never howls about his disasters.