Maturity: Be able to stick with a job until it is finished. Be able to bear an injustice without having to get even. Be able to carry money without spending it. Do your duty without being supervised.

Landers frames “maturity” not as age or sophistication but as practiced self-governance. Each clause names a concrete test of character: perseverance (finishing what you start), restraint (enduring unfairness without retaliation), self-control (holding money without impulsive spending), and integrity (doing one’s duty without external monitoring). The list reflects a mid‑20th‑century advice-column ethos that treats adulthood as a set of habits visible in everyday conduct rather than private intentions. Its moral center is delayed gratification and principled action—qualities that make a person reliable in work, relationships, and civic life even when no one is watching or rewarding them.