Source: Die Mathematik die Fackelträgerin einer neuen Zeit (Stuttgart, 1889), p. 39.
“The land of easy mathematics where he who works adds up and he who retires subtracts.”
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Núria Añó 6
Catalan writer novelist 1973Related quotes

“Of all Your work, not a thing You have forgotten; You did not add, and You did not subtract.”
It is a mandatory law that perfect operations stem from the perfect Operator.
Assorted Themes, On Creation

“He soon retires (i.e., into a cloister) who finds religion late.”
Source: Guzmán de Alfarache (1599-1604), Pt. II, Lib. I, Ch. III.

[Amir D. Aczel, The Artist and the Mathematician, http://books.google.com/books?id=fRCH-at7wgYC&pg=PA53, 29 April 2009, Basic Books, 978-0-7867-3288-3, 54]
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“Well doth he live who lives retired, and keeps
His wants within the limit of his means.”
Crede mihi, bene qui latuit bene vixit, et intra
Fortunam debet quisque manere suam.
Variant translation: Believe me that he who has passed his time in retirement, has lived to a good end, and it behoves every man to live within his means
III, iv, 26
Tristia (Sorrows)

cited in: Morris Kline (1969) Mathematics and the physical world. p. 1
Opus Majus, c. 1267

This quote was actually composed by Louis Nizer, and published in his book, Between You and Me (1948).
Misattributed
Variant: He who works with his hands is a laborer. He who works with his hands and his head is a craftsman. He who works with his hands and his head and his heart is an artist.

“Yes, that's how it is, child. He who works, he who is patient is the superior.”
Source: In the Ravine (1900), Ch. 5, pp. 208