Lincoln offers here something far harder than the usual exhortation to try your best: a permission slip to fail while keeping your conscience intact. Most people assume integrity and success are linked—that honesty pays off—but he severs them entirely, suggesting that fidelity to your principles matters even when (especially when) it guarantees nothing. A parent might spend years advocating for a child's special needs at school, winning no policy changes, yet find that their "light"—their commitment to doing right—made the struggle worthwhile rather than futile. The quote's real power lies in freeing us from the tyranny of outcomes and anchoring our self-respect instead to the honest effort itself.