Discipline does not mean suppression and control, nor is it adjustment to a pattern or ideology. It means a mind that sees 'what is' and learns from 'what was'.
I certainly do not adore the writer's discipline. I have lost lovers, endangered friendships, and blundered into eccentricity, impelled by a concentration which usually is to be found only in the minds of people about to be executed in the next half hour.
Free curiosity has greater power to stimulate learning than rigorous coercion. Nevertheless, the free ranging flux of curiosity is channeled by discipline under Your Law.
To invest successfully over a lifetime does not require a stratospheric IQ, unusual business insights, or inside information. What's needed is a sound intellectual framework for making decisions and the ability to keep emotions from corroding that framework. You must supply the emotional discipline.