“But of all these principles ours is the most simple; by the others we should be led into the most complicated calculations.”

— Carl Friedrich Gauss

Theoria motus corporum coelestium in sectionibus conicis solem ambientum (1809) Tr. Charles Henry Davis as Theory of the Motion of the Heavenly Bodies moving about the Sun in Conic Sections http://books.google.com/books?id=cspWAAAAMAAJ& (1857)
Context: The principle that the sum of the squares of the differences between the observed and computed quantities must be a minimum may, in the following manner, be considered independently of the calculus of probabilities. When the number of unknown quantities is equal to the number of the observed quantities depending on them, the former may be so determined as exactly to satisfy the latter. But when the number of the former is less than that of the latter, an absolutely exact agreement cannot be obtained, unless the observations possess absolute accuracy. In this case care must be taken to establish the best possible agreement, or to diminish as far as practicable the differences. This idea, however, from its nature, involves something vague. For, although a system of values for the unknown quantities which makes all the differences respectively less than another system, is without doubt to be preferred to the latter, still the choice between two systems, one of which presents a better agreement in some observations, the other in others, is left in a measure to our judgment, and innumerable different principles can be proposed by which the former condition is satisfied. Denoting the differences between observation and calculation by A, A’, A’’, etc., the first condition will be satisfied not only if AA + A’ A’ + A’’ A’’ + etc., is a minimum (which is our principle) but also if A4 + A’4 + A’’4 + etc., or A6 + A’6 + A’’6 + etc., or in general, if the sum of any of the powers with an even exponent becomes a minimum. But of all these principles ours is the most simple; by the others we should be led into the most complicated calculations.

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Carl Friedrich Gauss 50

German mathematician and physical scientist 1777–1855

Zheng Yuanjie (1955) Chiese writer

Zheng Yuanjie (2004) in: "Zheng Yuanjie's 19 years in fairy tales" on chinadaily.com.cn, May 10, 2004 ( online http://www.chinadaily.com.cn/english/doc/2004-05/10/content_329434.htm).

“The most complicated skill is to be simple.”

Dejan Stojanovic (1959) poet, writer, and businessman

Simplicity http://www.poetrysoup.com/famous/poem/21390/Simplicity
From the poems written in English

“Simple and complicated, as most true things are.”

David Levithan book Every Day

Variant: It’s as simple as that. Simple and complicated, as most true things are.
Source: Every Day

“Most people who haven't been trained in physics probably think of what physicists do as a question of incredibly complicated calculations, but that's not really the essence of it. The essence of it is that physics is about concepts, wanting to understand the concepts, the principles by which the world works.”

Edward Witten (1951) American theoretical physicist

"Edward Witten" interview, Superstrings: A Theory of Everything? (1992) ed. P.C.W. Davies, Julian Brown

“I believe that the most important principle is a very simple one”

Barack Obama (1961) 44th President of the United States of America

2016, Young Leaders of the Americas Initiative Town Hall (March 2016)
Context: And I think one of the things that's important for bringing about further progress is that we listen to each other and we understand our differences. I don't think it's necessary for us to all speak one language, or all have the same foods, or all have the same customs. But I do believe that there are some universal principles that are important. I believe that the most important principle is a very simple one that is at the heart of most of the world’s great religions, which is treat somebody the same way you’d want to be treated. And if you start with that basic premise, then we will continue to make progress. But I also think that in order for us to make progress, we have to have that fellow feeling and we have to combine that with the use of our brains and reason, and our intellect. […] That requires not just a strong heart, but also using our heads. And if we do those two things, then I feel confident that we'll make progress.

“I think we should not be in a great rush to deal with this issue. We should be patient and find the most suitable time to do away with the suspension. If we decide to start enrichment in the face of opposition by the West, we must find the best time and the most favorable conditions, and if we decide to work with the West, we must utilize all our capabilities and everything that is in our power to achieve our objectives. We should not rush into this. We must move very carefully, in a very calculated manner.”

Hassan Rouhani (1948) 7th President of Islamic Republic of Iran

Discussing Iran's strategy for advancing its nuclear program against the opposition of the international community
2004 speech to the Supreme Cultural Revolution Council