“[P]erhaps one of the most valuable results to be derived from a truly intellectual study of Astronomy is, the habit of keeping up a sustained attention to all the successive steps of a long series of reasonings. Power, and with it dignity, are gained to the mind by this noble exercise.”
Introduction
Popular Astronomy: A Series of Lectures Delivered at Ipswich (1868)
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George Biddell Airy 13
English mathematician and astronomer 1801–1892Related quotes

“Opinions derived from long experience are exceedingly valuable”
Context: Opinions derived from long experience are exceedingly valuable, and outweigh all others, while they are consistent with facts and with each other; but they are worse than useless when they lead, as in this instance, to directly opposite opinions.

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Source: The Principles of Agriculture, 1844, Section I: The fundamental principles, p. 1.

Source: 1910s, Mysticism and Logic and Other Essays http://archive.org/stream/mysticism00russuoft/mysticism00russuoft_djvu.txt (1918), Ch. 4: The Study of Mathematics

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Chisholm v. Georgia, 2 U.S. (2 Dallas) 419 (1793), at 455.

“All which is beautiful and noble is the result of reason and calculation.”