With self-discipline most anything is possible.

The line expresses a characteristically Rooseveltian faith in willpower: disciplined habits—training the body, governing impulses, persisting through discomfort—expand what a person can accomplish. Read this way, “self-discipline” is not mere self-denial but a practical method for converting ideals into action. The claim also reflects a moral dimension often present in Roosevelt’s rhetoric: mastery of the self precedes leadership and public service. At the same time, the sweeping “most anything” is best taken as motivational emphasis rather than a literal promise; it highlights the transformative leverage of sustained effort, even if it cannot erase all external limits (health, circumstance, injustice).