“In a constantly revolving circle every point is simultaneously a point of departure and a point of return. If we interrupt the rotation, not every point of departure is a point of return.”

Pártase de cualquier punto. Todos son iguales. Todos llevan a un punto de partida.
Voces (1943)

Facebook Nation: Total Information Awareness (2nd Edition), 2014

Anathemas and Admirations (1987)

Facebook Nation: Total Information Awareness (2nd Edition), 2014

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

Source: 1970s and later, Cohesion in English (English Language), 1976, p. 212.
Context: The theme is what is being talked about, the point of departure for the clause as message, and the speaker has within certain limits the option of selecting any element in the clause as thematic.

Catch phrase, often repeated
There and Back Again (1999)

On Certainty (1969)
Context: 105. All testing, all confirmation and disconfirmation of a hypothesis takes place already within a system. And this system is not a more or less arbitrary and doubtful point of departure for all our arguments; no it belongs to the essence of what we call an argument. The system is not so much the point of departure, as the element in which our arguments have their life.

Source: The Comedians (1966)