“Mind-masses entering the soul appear to us as ideas, the quality of the latter depending on the inner state of the former.”
Gesammelte Mathematische Werke (1876)
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Bernhard Riemann 43
German mathematician 1826–1866Related quotes

All thinking is, accordingly, formation of new mind masses.
Gesammelte Mathematische Werke (1876)

Source: The Essays: A Selection

Letter to Benjamin Harrison V (9 March 1789), published in Washington's Writings: Being His Correspondence, Addresses, Messages, and Other Papers, Official and Private, Selected and Published from the Original Manuscripts https://play.google.com/store/books/details?id=DTlEAQAAMAAJ&rdid=book-DTlEAQAAMAAJ&rdot=1, Volume IX, p. 475.
1780s

Orot Yisrael, Ch. 5, article 10, p. 156; as quoted in "The Distinction between Jews and Gentiles in Torah" by Rabbi David Bar Chaim http://www.daatemet.org.il/articles/article.cfm?article_id=119&lang=en
Variant:
The dissimilarity between the Jewish soul, in all its independence, inner desires, longings, character and standing vis-à-vis the soul of all the Gentiles — on all of their levels — is greater and deeper than the difference between the soul of a man and the soul of an animal, for the difference in the latter case is one of quantity, while the difference in the first case is one of essential quality
As quoted in "A British Synagogue Bans a Famous Hassidic Text!" (February 2010) by Rabbi Michael Leo Samuel http://rabbimichaelsamuel.com/2010/02/2744/#_ftn1.
Orot