I have learned all kinds of things from my many mistakes. The one thing I never learn is to stop making them.

The line wryly distinguishes between learning from experience and achieving self-mastery. The speaker claims to have extracted lessons from repeated failures—suggesting reflection, resilience, and a capacity for growth—yet admits an inability (or unwillingness) to break the underlying pattern. The humor comes from the anticlimax: wisdom accumulates, but behavior remains stubbornly human. In Abercrombie’s grimly comic mode, it also hints at fatalism and the limits of moral improvement: people may understand their flaws perfectly and still reenact them. The quote can be read as a critique of simplistic “learn from your mistakes” platitudes, emphasizing that insight does not automatically translate into change.