“Painting is an act, a sequence of movements one bears within oneself, whose source is one's inner being.”

Source: undated quotes, The Daily Practice of Painting, Writings (1962-1993), p. 78

1949 - 1958, Speech to the Penguins' (1949)

Source: Lectures on Philosophy (1959), p. 76

The School of New York, exhibition catalogue, Perls Gallery, 1951; as quoted in the New York School – the painters & sculptors of the fifties, Irving Sandler, Harper & Row Publishers, 1978, p. 46
1950s

"Feminism: An Agenda" (1983)
Letters from a War Zone: Writings 1976-1987

1990s, Why "Free Software" is better than "Open Source" (1998)
Context: While free software by any other name would give you the same freedom, it makes a big difference which name we use: different words convey different ideas.
In 1998, some of the people in the free software community began using the term "open source software" instead of "free software" to describe what they do. The term "open source" quickly became associated with a different approach, a different philosophy, different values, and even a different criterion for which licenses are acceptable. The Free Software movement and the Open Source movement are today separate movements with different views and goals, although we can and do work together on some practical projects.
The fundamental difference between the two movements is in their values, their ways of looking at the world. For the Open Source movement, the issue of whether software should be open source is a practical question, not an ethical one. As one person put it, "Open source is a development methodology; free software is a social movement." For the Open Source movement, non-free software is a suboptimal solution. For the Free Software movement, non-free software is a social problem and free software is the solution.

Alles, alles kann einer vergessen, nur nicht sich selbst, sein eigenes Wesen.
Parerga and Paralipomena (1851), Aphorisms on the Wisdom of Life