The two enemies of human happiness are pain and boredom.

Arthur Schopenhauer (1788–1860) develops this thought within his pessimistic philosophy, especially in his later, more essayistic writings that distill themes from his system: the primacy of “will,” the ubiquity of suffering, and the instability of satisfaction. In his view, human life oscillates between the distress of unmet desire and the emptiness that follows when desire is temporarily stilled. The remark is typically associated with his discussions of the “vanity of existence” and the restless character of wanting, where happiness is not a stable state but a brief interval between negative conditions.

The aphorism frames happiness negatively: it is less a positive achievement than the absence of two pervasive threats. “Pain” stands for suffering in the broad Schopenhauerian sense—frustration, loss, bodily and mental distress—generated by incessant striving. “Boredom” names the other side of the same mechanism: when striving is satisfied, the will lacks an object and consciousness experiences emptiness and meaninglessness. The quote thus encapsulates Schopenhauer’s famous “pendulum” model of life, suggesting that ordinary existence swings between these poles and that lasting contentment is structurally difficult within the human condition.

1) “The two foes of human happiness are pain and boredom.”
2) “Life swings like a pendulum backward and forward between pain and boredom.”