Discipline strengthens the mind so that it becomes impervious to the corroding influence of fear.
Fear comes from uncertainty. When we are absolutely certain whether of our worth or worthlessness we are almost impervious to fear.
It is of course further indication that a fundamentalist right has really taken over much of the Republican Party People might cite George Bush as proof that you can be totally impervious to the effects of Harvard and Yale education.
And one who is just of his own free will shall not lack for happiness and he will never come to utter ruin.