But since the doctor has a standard by reference to which he distinguishes what is healthy for the body from what is not, and with reference to which each thing up to a certain point ought to be done and is healthy, while if less or more is done health is the result no longer, so in regard to actions and choice of what is naturally good but not praiseworthy, the good man should have a standard both of disposition and of choice and avoidance with regard to excess or deficiency of wealth and good fortune,