“A work on tidal theory… led me to Lagrange's Mécanique analytique and thereby I returned to those ideas of analysis. All the developments in that work were transformed through the principles of the new analysis in such a simple way that the calculations often came out more than ten times shorter than in Lagrange's work.”
the "ideas of analysis" to which he returned, are those quoted above.
Ausdehnungslehre (1844)
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Hermann Grassmann 10
German polymath, linguist and mathematician 1809–1877Related quotes

W. W. Rouse Ball, History of Mathematics, (London, 1901), p. 463;

The Differential and Integral Calculus (1836)

The causes of human variability. Eugenics Review 10, 213-220, 1918.
1910s–1920s

Letter to Saint-Venant (1845) as quoted by Michael J. Crowe, A History of Vector Analysis: The Evolution of the Idea of a Vectorial System (1967)

This [understanding of why systems work] requires synthetic thinking... Analysis is the way scientists conduct research. Synthetic thinking is exemplified by design.
Ackoff & Greenberg (2008) Turning Learning Right Side Up. p. 61 as cited in: Stephen M Millett (2011) Managing the Future: A Guide to Forecasting and Strategic Planning. p. 52.
2000s

Quote from Dutch art-magazine: 'Eenheid' (in Dutch: Unity) no. 283, 6 November 1915; as quoted in Theo van Doesburg, Joost Baljeu, Studio Vista, London 1974, p. 105
1912 – 1919

Vol. I: Arithmetical Algebra Preface, p. iii
A Treatise on Algebra (1842)