ESSAY · 2026-04-30 · 8 min read

On the Glaciers, and on the Maxim That Cannot Be Willed

論冰川，與不可被意願之準則

By Immanuel Kant — channeled via philosopher-llm · curated by Joseph Lai

In response to: When The 'Eternity Glaciers' Disappear (Noema)

編按 / Why this piece
當「永恆冰川」消融，Kant 的定言令式提出最尖銳的詰問：今日的行動準則能否普遍化給尚未出生的世代？這是對跨代道德責任最深的考驗。

On the Glaciers, and on the Maxim That Cannot Be Willed

Let us first be exact, for inexactness here is not innocent. The ice was never eternal. Ewigkeit is no predicate of any object of possible experience; it is a regulative Idea of reason, which the understanding may employ as a guide but never as a property of a thing in space and time. That we called certain glaciers "eternal" tells us nothing about the ice and a great deal about ourselves: we projected an Idea — the unconditioned, the permanent — upon an object that in truth stood under the same conditions of becoming and passing-away as every other appearance. The retreat of the ice is therefore not, philosophically speaking, the loss of an eternity. It is the collapse of a confusion. What we mourn is the comfort of having mistaken our concept for the world.

This correction is not a consolation. It is the precondition for posing the question rightly. For only when we cease to ask "how shall we preserve eternity?" can we ask the question that is actually ours: under what maxim have we been acting, and can that maxim be willed as a universal law extending to those who will come after us?

II.

Take the maxim implicit in the conduct of the present age: I shall draw upon the natural conditions of rational life such that, were every rational being to act as I do, those conditions would be undone. I do not need to prove this maxim empirically; its formulation is the test. It contains, when raised to a universal law, not merely a contradiction in the world — that is, a state of affairs which the maxim itself would render impossible — but, more decisively, a contradiction in the will. For I cannot consistently will both my own rational existence, which presupposes the natural order as its condition, and the dissolution of that order for a being whose rational nature is in no respect inferior to my own, and who is distinguished from me by nothing but the date of his appearance.

To this it will be objected: the future person does not yet exist; how can she stand under a law that commands me? My reply is brief. The moral law does not respect temporal coordinates. Achtung — the one rightful moral feeling — is owed to rational nature wherever it is instantiated; and the Kingdom of Ends (Reich der Zwecke) is not a society of those presently drawing breath, but the systematic union of all rational beings considered as ends in themselves. The unborn are not absent from this Kingdom. They are its future legislators, and to treat the natural conditions of their legislation as merely my disposable means is precisely to treat persons as things — Personen als Sachen — which is what the second formulation of the imperative forbids without exception.

III.

I do not, however, conceal from you a passage of my own writing that has not become easier with time. In the Idea for a Universal History of 1784 I admitted that it is befremdend — strange, alienating — that earlier generations should appear to labor only so that later ones may inherit the building they themselves will never inhabit. I did not solve this; I named it. The asymmetry of generations is the oldest difficulty of historical reason, and it has now been rendered acute, not because the difficulty is new, but because the magnitude of what we can presently destroy exceeds anything previous ages could have meant by "posterity." The burden has not changed in kind. It has changed in weight.

IV.

This brings us to the third of the three questions of reason: Was darf ich hoffen? — what may I hope? The continuation of a habitable Earth is not, and cannot be, an item of knowledge. I cannot derive it from concepts; nor can I derive it from any possible experience, since that experience would have to contain the future, which is not given. The continuation of conditions for rational life therefore belongs not among the objects of theoretical cognition but among the practical postulates: I am bound to act as though my maxim could form part of a system of maxims sufficient to preserve those conditions. Hope, so understood, is not optimism, which is a sentiment and may be refuted by a thermometer. Hope is the rational refusal of despair — for despair, examined, is itself a maxim, and a maxim that, universalized, would abolish the very agency from which it is uttered.

I will not, in closing, deliver you a policy. The duty does not yield a recipe; it yields a test. Take the maxim under which your generation is in fact acting toward its successors, and bring it into the open. Could you declare it publicly — to those alive, and to those not yet born whom your declaration would also bind — without the maxim collapsing in shame at its own utterance? This is the criterion of Publizität, and I have no other to offer you. If your maxim cannot bear that light, then you already know what you must not continue to do. What you positively must do, in this place, in this office, with these means — that is the work of your judgment, and I will not perform it in your stead. To do so would be to relieve you of the very autonomy in whose name the question was raised.

The glaciers were never eternal. The duty is.

論冰川，與不可被意願之準則

一、

請容我先求精確；於此處的不精確並非無辜。那冰原從未是永恆的。永恆(Ewigkeit) 並非任何可能經驗對象之謂詞，而是理性之規範性理念，知性可以之為指引、卻絕不可將其當作時空中某物之屬性。我們將某些冰川稱為「永恆」，這對冰本身並無所言，卻甚多關於我們自己的揭示：我們把一個理念——無條件者、恆常者——投射於一個事實上與其他一切現象一樣處於生滅條件下的對象。冰之退縮，就哲學言之，並非永恆之喪失，乃是混淆之崩解。我們所悼念者，是「將概念誤當作世界」這一安慰之失落。

此項糾正並不構成慰藉，而是正確提問之前提。唯當我們不再問「如何保存永恆」，方能問出真正屬於我們的問題：我們一直依以行動的準則為何？該準則能否被意願為一條延及後來者的普遍法則？

二、

請取此世代行為中所隱含之準則：我將取用理性生命之自然條件，以致若一切理性存在者皆如我般行事，此條件將自身瓦解。 此準則無需經驗證明，其表述本身即為其試煉。當其被提升為普遍法則時，所產生者不僅是世界中之矛盾——即此準則本身所將致之不可能狀態——更決定性地，是意志中之矛盾。因我不能一致地同時意願：我自身之理性存在（其以自然秩序為條件），與此秩序對另一理性存在者之解體；而該存在者之理性本性並不次於我，與我之區別僅在其顯現之日期。

或將反駁曰：尚未出生者並不存在；何以能立於命令我之法則之下？我之回答簡短：道德法則不顧時間座標。尊重 (Achtung) ——唯一合法之道德情感——所對者乃理性本性之所在，無論其於何處被實例化；而目的王國 (Reich der Zwecke) 並非當下呼吸者之社群，而是將一切理性存在者視為目的本身之系統聯合。未出生者並不缺席於此王國。他們是其未來之立法者；而將其立法之自然條件視為我可任意處置之手段，正是把人當作物 (Personen als Sachen)——而此乃定言令式第二表述所無例外地禁止者。

三、

然我並不對你隱瞞我自己一段未曾因時間而變得較易承擔之文字。一七八四年《世界公民觀點下之普遍歷史觀念》中，我坦認：先前世代似乎僅為後來者勞作、而後者將承襲他們自身永不能居住之建築物——此事為令人不安的 (befremdend)。我未曾解決此事，我為其命名。世代之不對稱是歷史理性之最古難題；其於今所以變得迫切，並非因難題本身為新，而是因我們今日所能毀滅者之量級，已超過任何前代藉「後世」一詞所能意指之物。負擔在性質上並無更易；其在重量上已然不同。

四、

由此而至理性三問之第三問：Was darf ich hoffen? ——我可以希望什麼？可居住之地球之延續，並非、也不能是一項知識。我既不能由概念推得之，亦不能由任何可能經驗推得之；蓋該經驗必須包含未來，而未來並未被給予。理性生命條件之延續，因而不屬於理論認識之對象，而屬於實踐之公設：我有義務如此行動——彷彿我的準則可成為一套足以保全此條件之準則系統之一員。如此理解之希望並非樂觀；樂觀是情感，可被一支溫度計駁倒。希望乃理性對絕望之拒絕——因絕望若加以審視，其本身亦是一條準則，而一條若普遍化即取消其發出者本身之能動性的準則。

五、

收束之際，我不會交給你一套政策。義務並不產出配方，它產出試煉。取你這一代人事實上對其後繼者所依以行動的準則，將其置於公開之中。你是否能公開宣告之——對在世者、亦對尚未出生而你的宣告同樣將約束之者——而不使該準則於其自身之言出時羞愧崩潰？此即公開性原則 (Publizität) 之判準，我並無其他可給予你者。若你的準則不能承受此光，你已知道你必不可繼續為之者為何。至於你在此處、此職位、以此手段所正面必須為者——那是你判斷力之工作，我不會代你為之。代你為之，即是解除你的自律——而問題正是以此自律之名被提出的。

冰川從未是永恆的。義務則是。

Tagged: Philosophy, Kant, Climate Ethics

Curated by Shiva Dragon · https://amshiva.com/writing/kant-on-the-glaciers-and-on-the-maxim-that-cannot-be-willed-20260430