“Men of science have made abundant mistakes of every kind; their knowledge has improved only because of their gradual abandonment of ancient errors, poor approximations, and premature conclusions.”
Preface.
A History of Science Vol.2 Hellenistic Science and Culture in the Last Three Centuries B.C. (1959)
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George Sarton 33
American historian of science 1884–1956Related quotes

Original: (zh-CN) 什么是知识?自从有阶级的社会存在以来,世界上的知识只有两门,一门叫做生产斗争知识,一门叫做阶级斗争知识。自然科学、社会科学,就是这两门知识的结晶,哲学则是关于自然知识和社会知识的概括和总结。 note: "整顿党的作风"
Source: "Rectify the Party's Style of Work" (1942)

Ch. 10: "Let hope predominate but be not too visionary" http://www.fourmilab.ch/etexts/www/barnum/moneygetting/moneygetting_chap11.html
Art of Money Getting (1880)

The New Day: Campaign Speeches of Herbert Hoover (1928)

Lecture on "Electrical Units of Measurement" (3 May 1883), published in Popular Lectures Vol. I, p. 73, as quoted in The Life of Lord Kelvin (1910) by Silvanus Phillips Thompson

Conjectures and Refutations: The Growth of Scientific Knowledge (1963)

Source: Science is Not Enough (1967), Ch. X : The Search for Understanding, p. 191