“Extreme joy and extreme sorrow are indistinguishable beyond a certain point.”

Book I : The Beginnings, Ch. VI : An Assembly In Paradise
Penguin Island (1908)
Context: When the baptism of the penguins was known in Paradise, it caused neither joy nor sorrow, but an extreme surprise. The Lord himself was embarrassed. He gathered an assembly of clerics and doctors, and asked them whether they regarded the baptism as valid.

Alternative translation: Subtle and insubstantial, the expert leaves no trace; divinely mysterious, he is inaudible. Thus he is master of his enemy's fate.
Alternative translation: O divine art of subtlety and secrecy! Through you we learn to be invisible, through you inaudible and hence we can hold the enemy's fate in our hands.
The Art of War, Chapter VI · Weaknesses and Strengths
Context: Be extremely subtle, even to the point of formlessness. Be extremely mysterious, even to the point of soundlessness. Thereby you can be the director of the opponent's fate.

(zh-TW) 微乎微乎，至於無形；神乎神乎，至於無聲；故能為敵之司命。
Alternative translation: Subtle and insubstantial, the expert leaves no trace; divinely mysterious, he is inaudible. Thus he is master of his enemy's fate.
Alternative translation: O divine art of subtlety and secrecy! Through you we learn to be invisible, through you inaudible and hence we can hold the enemy's fate in our hands.
The Art of War, Chapter VI · Weaknesses and Strengths

[Exclusive interview with Oliver Blackburn, Total Film, http://www.totalfilm.com/trailers/donkey-punch-exclusive-interview-with-oliver-blackburn, 2011, Future Publishing Limited, 23 February 2012]

The Concept of the Political (1927)

5; variant translations:
From a certain point onward there is no longer any turning back. That is the point that must be reached.
As quoted in The Unfinished Country: A Book of American Symbols (1959) by Max Lerner, p. 452; also in Wait Without Idols (1964) by Gabriel Vahanian, p, 216; in Joyce, Decadence, and Emancipation (1995) by Vivian Heller, 39; in "The Sheltering Sky" (1949) by Paul Bowles, p. 213; and in the poem "Father and Son" by Delmore Schwartz.
There is a point of no return. This point has to be reached.
The Zürau Aphorisms (1917 - 1918)
Variant: From a certain point onward there is no longer any turning back. That is the point that must be reached.
Source: The Trial

As quoted in "Emotional Intelligence" by James Mottram, in The Sunday Herald (8 January 2006)
Context: I think the characters I play go through tunnels, like in Three Colours : Blue, for example, where she’s lost everything... In The English Patient, she loses her best friend; this patient is dying in front of her – there’s no hope, so she’s going to start from the bottom. In films we see extremes, because it’s where you have turning points. Before I thought there was a common denominator between my films — as if all my characters were sisters – but I’m not so sure now.

In SEEKING KNOWLEDGE IN THE LIGHT OF ISLAM https://www.youtube.com/watch?v=kOC6iZNwvqc

Act IV, scene 5, line 48 (796).
Variant translations:
The highest law is often the greatest wrong.
Extreme justice is often extreme malice.
Heauton Timorumenos (The Self-Tormentor)