“… mathematicians progress only by doubt, through humble and constant attempts to impinge on the immense domain of the unknown.”
[Leopold Infeld, Whom the Gods Love: The Story of Évariste Galois, Whittlesey House, 1948, 9]
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Leopold Infeld 2
Polish physicist 1898–1968Related quotes

“At is taking risks.... a sincere attempt to achieve the impossible, the unknown.”
short quotes, 14 September 1967; p. 68
1960's, Conversations with Samuel Beckett and Bram van Velde' (1965 - 1969)

“Change is inevitable. In a progressive country change is constant. ”

Cited in Soviet Youth and Socialism http://leninist.biz/en/1974/SYAS228/3.1-Youth.and.Culture

“Progress' constant companion is nostalgia for the way things used to be.”
"Pandora's Box", This American Life, television season 1, installment 6, 26 April 2007.
This American Life

“The world has not been hindered in its progress, but immensely aided in it, by England.”
Source: The National System of Political Economy (1841), p. 365

Speech at the Albert Hall (4 December 1924), quoted in On England, and Other Addresses (1926), p. 70.
1924

“Without a constant misuse of language, there cannot be any discovery, any progress.”
pg. 27.
Against Method (1975)
Source: Against Method: Outline of an Anarchistic Theory of Knowledge

The Renaissance in India (1918)
Context: To attempt to penetrate through the indeterminate confusion of present tendencies and first efforts in order to foresee the exact forms the new creation will take, would be an effort of very doubtful utility. One might as well try to forecast a harmony from the sounds made by the tuning of the instrument. In one direction or another we may just detect certain decisive indications, but even these are only first indications and we may be quite sure that much lies behind them that will go far beyond anything that they yet suggest. This is true whether in religion and spirituality or thought and science, poetry and art or society and politics. Everywhere there is, at most, only a beginning of beginnings.