Your arm’s too short to box with God.

The line is a vivid, colloquial warning against hubris: it imagines a person trying to “box” (fight) God, only to be defeated by the sheer mismatch in power and reach. Read more broadly, it cautions against defying moral law, fate, or the limits of human control—especially when anger, pride, or self-righteousness tempts someone into a futile struggle. The phrasing draws on vernacular speech and the imagery of prizefighting, giving the admonition punch and memorability. Even when used outside a religious frame, it functions as a reminder that some forces—history, mortality, conscience, or the consequences of one’s actions—cannot be outmaneuvered.