Source: Principles of Gestalt Psychology, 1935, p. 176
Context: Even these humble objects reveal that our reality is not a mere collocation of elemental facts, but consists of units in which no part exists by itself, where each part points beyond itself and implies a larger whole. Facts and significance cease to be two concepts belonging to different realms, since a fact is always a fact in an intrinsically coherent whole. We could solve no problem of organization by solving it for each point separately, one after the other; the solution had to come for the whole. Thus we see how the problem of significance is closely bound up with the problem of the relation between the whole and its parts. It has been said: The whole is more than the sum of its parts. It is more correct to say that the whole is something else than the sum of its parts, because summing is a meaningless procedure, whereas the whole-part relationship is meaningful.
“In all the previous cases of wholes, we have nowhere been able to argue from the parts of the whole. Compared to its parts, the whole constituted by them is something quite different, something creatively new, as we have seen. Creative evolution synthesises from the parts a new entity not only different from them, but quite transcending them. That is the essence of a whole. It is always transcendent to its parts, and its character cannot be inferred from the characters of its parts.”
Source: Holism and Evolution (1926), p. 342
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Jan Smuts 30
military leader, politician and statesman from South Africa 1870–1950Related quotes

“The part always has a tendency to reunite with its whole in order to escape from its imperfection.”
The Notebooks of Leonardo da Vinci (1883), XIX Philosophical Maxims. Morals. Polemics and Speculations.
As cited in: D.C. (1969) "Systems Theory — A Discredited Philosophy". in: Abacus V. p. 4
1950s, Problems of Life (1952, 1960)

The Notebooks of Leonardo Da Vinci (1938), I Philosophy
Source: General System Theory (1968), 2. The Meaning of General Systems Theory, p. 31

“The whole is simpler than its parts.”
Quoted by Irving Fisher in "The Applications of Mathematics to the Social Sciences," Bulletin of the American Mathematical Society 36, 225-243 (1930). Full article http://projecteuclid.org/euclid.bams/1183493954
Attributed

Pt. II, The Knowable; Ch. XIV, Summary and Conclusion
First Principles (1862)

Part I : Contemporary Issues in Science, Ch. 1 : "The Scientist as Rebel"
The Scientist As Rebel (2006)
Context: The progress of science requires the growth of understanding in both directions, downward from the whole to the parts and upward from the parts to the whole. A reductionist philosophy, arbitrarily proclaiming that the growth of understanding must go only in one direction, makes no scientific sense. Indeed, dogmatic philosophical beliefs of any kind have no place in science.

Letter to Sister Mary James Power (1 October 1934); published in The Wild God of the World : An Anthology of Robinson Jeffers (2003), edited by Albert Gelpi, p. 189; also partly quoted in the essay "Robinson Jeffers, Pantheist Poet" http://web.archive.org/20011119074326/members.aol.com/PHarri5642/jeffers.htm by John Courtney
Context: I believe that the Universe is one being, all its parts are different expressions of the same energy, and they are all in communication with each other, therefore parts of one organic whole. (This is physics, I believe, as well as religion.) The parts change and pass, or die, people and races and rocks and stars, none of them seems to me important in itself, but only the whole. This whole is in all its parts so beautiful, and is felt by me to be so intensely in earnest, that I am compelled to love it and to think of it as divine. It seems to me that this whole alone is worthy of the deeper sort of love and there is peace, freedom, I might say a kind of salvation, in turning one's affections outward toward this one God, rather than inwards on one's self, or on humanity, or on human imaginations and abstractions — the world of spirits.
I think it is our privilege and felicity to love God for his beauty, without claiming or expecting love from him. We are not important to him, but he to us.

“The whole is greater than the sum of its parts.”