The flame of anger, bright and brief, sharpens the barb of love.

The line yokes two intense emotions—anger and love—suggesting they are not opposites so much as volatile neighbors. Anger is figured as a flame: it flares up quickly (“bright and brief”), but in that moment it can harden speech and intention, “sharpening” love into something that wounds. The “barb” implies that love, ordinarily associated with tenderness, can become hooked and painful when mixed with resentment, leaving injuries that linger after the heat has passed. Read this way, the aphorism cautions that lovers’ quarrels are dangerous precisely because affection gives anger its aim: it knows where to strike.