“Every point is a turning point.”

Vol. II, Ch. IV, p. 104.
(Buch II) (1893)

The Architecture of Theories (1891)
Context: Three conceptions are perpetually turning up at every point in every theory of logic, and in the most rounded systems they occur in connection with one another. They are conceptions so very broad and consequently indefinite that they are hard to seize and may be easily overlooked. I call them the conceptions of First, Second, Third. First is the conception of being or existing independent of anything else. Second is the conception of being relative to, the conception of reaction with, something else. Third is the conception of mediation, whereby a first and second are brought into relation.

A Conversation with Ward Cunningham (2003), Collective Ownership of Code and Text
Context: It was a turning point in my programming career when I realized that I didn't have to win every argument. I'd be talking about code with someone, and I'd say, "I think the best way to do it is A." And they'd say, "I think the best way to do it is B. I'd say, "Well no, it's really A." And they'd say, "Well, we want to do B." It was a turning point for me when I could say, "Fine. Do B. It's not going to hurt us that much if I'm wrong. It's not going to hurt us that much if I'm right and you do B, because, we can correct mistakes. So lets find out if it's a mistake."

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

Presidency (1977–1981), The Crisis of Confidence (1979)
Context: We know the strength of America. We are strong. We can regain our unity. We can regain our confidence. We are the heirs of generations who survived threats much more powerful and awesome than those that challenge us now. Our fathers and mothers were strong men and women who shaped a new society during the Great Depression, who fought world wars, and who carved out a new charter of peace for the world.
We ourselves are the same Americans who just 10 years ago put a man on the Moon. We are the generation that dedicated our society to the pursuit of human rights and equality. And we are the generation that will win the war on the energy problem and in that process rebuild the unity and confidence of America.
We are at a turning point in our history. There are two paths to choose. One is a path I've warned about tonight, the path that leads to fragmentation and self- interest. Down that road lies a mistaken idea of freedom, the right to grasp for ourselves some advantage over others. That path would be one of constant conflict between narrow interests ending in chaos and immobility. It is a certain route to failure.
All the traditions of our past, all the lessons of our heritage, all the promises of our future point to another path, the path of common purpose and the restoration of American values. That path leads to true freedom for our Nation and ourselves. We can take the first steps down that path as we begin to solve our energy problem.
Energy will be the immediate test of our ability to unite this Nation, and it can also be the standard around which we rally. On the battlefield of energy we can win for our Nation a new confidence, and we can seize control again of our common destiny.

Book III. Concerning Petitions and Axioms.
The Philosophical and Mathematical Commentaries of Proclus on the First Book of Euclid's Elements Vol. 2 (1789)

Tarkan Q & A, Tarkan Translations, April 10, 2003 http://tarkantr.blogspot.com/2005/05/q.html,

Stetigkeit und irrationale Zahlen (1872)