Nobody’s enemy but his own.

The line characterizes a person whose troubles are largely self-inflicted: he has no true external adversary, only the consequences of his own temperament, choices, or habits. In Dickensian terms, it often implies moral blindness or self-sabotage—someone who imagines hostility in the world but is undone chiefly by pride, impulsiveness, addiction, or stubbornness. The phrase can also carry a note of pity rather than condemnation, suggesting that reform is possible because the “enemy” is internal and therefore, in principle, within one’s power to confront. As a compact judgment, it fits Dickens’s recurring interest in character as destiny.