“It is unquestionably the peacefulness and calm of the Spinozist system which particularly produces the idea of its depth, and which, with hidden but irresistible charm, has attracted so many minds. The Spinozist system will also always remain in a certain sense a model. A system of freedom — but with just as great contours, with the same simplicity, as a perfect counter-image (Gegenbild) of the Spinozist system — this would really be the highest system. This is why Spinozism, despite the many attacks on it, and the many supposed refutations, has never really become something truly past, never been really overcome up to now, and no one can hope to progress to the true and the complete in philosophy who has not at least once in his life lost himself in the abyss of Spinozism. Nobody who wishes to arrive at his own firm conviction should leave unread the main work of Spinoza, his Ethics (for he presented his system under this title), and I should like to urge everyone who is seriously concerned with his education not only to study assiduously on his own, which no teacher can replace, but to be most conscientious and careful in the choice of what he reads.”

Crip Theory: Cultural Signs of Queerness and Disability (NYU Press: 2006), p. 2

Source: Systems Engineering Tools, (1965), Systems Engineering Methods (1967), p. 1: First paragraph of Ch. 1. The Environment for System Engineering Methods

Source: Models of Mental Illness (1984), p. 102

1970s, Towards a System of Systems Concepts, 1971

Source: Definition of System, 1956, p. 18: Introduction

Human Nature and Social Theory (1969)
Context: One will be conducive to cooperation and solidarity another social structure to competition, suspiciousness, avarice; another to child-like receptiveness, another to destructive aggressiveness. All empirical forms or human needs and drives have to be understood as results of the social practice (in the last analysis based on the productive forces, class structure, etc., etc.) but they all have to fulfill the functions which are inherent in man’s nature in general, and that is to permit him to relate himself to others and share a common frame of reference, etc. The existential contradiction within man (to which I would now add also the contradiction between limitations which reality imposes on his life, and the virtually limitless imagination which his brain permits him to follow) is what I believe to be one of the motives of psychological and social dynamics. Man can never stand still. He must find solutions to this contradiction, and ever better solutions to the extent to which reality enables him.
The question then arises whether there is an optimal solution which can be inferred from man’s nature, and which constitutes a potential tendency in man. I believe that such optimal solutions can be inferred from the nature of man, and I have recently found it quite useful to think in terms of what in sociology and economy is now often called »system analysis«. One might start with the idea, in the first place, that human personality — just like society — is a system, that is to say, that each part depends on every other, and no part can be changed unless all or most other parts are also changed. A system is better than chaos. If a society system disintegrates or is destroyed by blows from the outside the society ends in chaos, and a completely new society is built upon its ruins, often using the elements of the destroyed system to build the new. That has happened many times in history. But, what also happens is that the society is not simply destroyed but that the system is changed, and a new system emerges which can be considered to be a transformation of the old one.

Kosmos (1932)

Source: Biology of Cognition (1970), p. 26-27.

Source: General System Theory (1968), 2. The Meaning of General Systems Theory, p. 37