failures to one that passed on to success.

There are some business men who look upon psychology as "blue-sky"
theorizing or "new thought." There are others who have a hazy idea
that it is a sort of unfathomable mystery intended to amuse
long-haired scientists. The truth is that every one of these same
business men, if he is getting ahead, is unconsciously using
psychological principles to the profit of his own business every day
in the year.

[Sidenote: _Devices for Commercial Efficiency_]

In the books that are to follow we shall show you the immense
practical value of a truly scientific psychology. You shall come into
the psychological laboratory with us and work out rational, scientific
and exact methods by which, without possibility of failure and with
but reasonable effort, you can at any moment completely concentrate
your mental powers. You shall be instructed in simple devices for
mastering scattered energies, repressing wasteful habits, banishing
depressive moods and raising yourself to a far higher level of
commercial efficiency.