Promises are the uniquely human way of ordering the future, making it predictable and reliable to the extent that this is humanly possible.

Arendt develops this idea in her analysis of “action” in the modern condition, where human beings initiate new, unpredictable processes through speech and deeds in a shared public world. Because action sets off chains of consequences no one can fully control, political and social life would be dangerously unstable without practices that create islands of reliability. In this framework, promising (along with forgiving) is a stabilizing faculty: it binds actors to future courses and makes cooperation possible among plural, free individuals. The remark belongs to Arendt’s mid‑century effort to rethink politics after the catastrophes of totalitarianism and war, emphasizing how ordinary human capacities sustain durable common life.

Arendt treats a promise not as a private moral sentiment but as a public, linguistic act that creates a dependable relation over time. The future is inherently uncertain because human freedom means people can always begin anew; yet communities require some continuity to plan, trust, and act together. Promising is “uniquely human” because it depends on speech, mutual recognition, and accountability—features of life among others rather than mere instinct or necessity. The phrase “to the extent that this is humanly possible” underscores a limit: promises cannot eliminate contingency, but they can carve out provisional stability, enabling responsibility and political agency without denying freedom.