“Up to the present time, in experiments on diffraction there has been no instrument, except a magnifying-glass, which could be used with profit; and this may perhaps be one of the reasons why in this field of physical optics we are so backward, and why we know so little of the laws of this modification of light.”

— Joseph von Fraunhofer

Prismatic and Diffraction Spectra: Memoirs http://books.google.com/books?id=5GE3AAAAMAAJ (1899) Tr. & Ed. J. S. Ames p. 13

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Joseph von Fraunhofer7

German optical physicist 1787–1826

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“In order to receive in the eye all the light diffracted through a narrow opening, and to see the phenomena strongly magnified; still more in order to directly measure the inflection of the light, I placed in front of the objective of a theodolite-telescope a screen in which there was a narrow vertical opening which could be made wider or narrower by means of a screw. By means of a heliostat I threw sunlight into a darkened room through a narrow slit so that it fell upon this screen, through whose opening the light was therefore diffracted. I could then observe through the telescope the phenomena produced by the diffraction, magnified, and yet seen with sufficient brightness; and at the same time I could measure the angles of inflection of the light by means of the theodolite.”

Joseph von Fraunhofer (1787–1826) German optical physicist

Prismatic and Diffraction Spectra: Memoirs (1899) Tr. & Ed. J. S. Ames p. 14-15

“We perceive that a great breach has been made in the moral and physical systems by the introduction of moral and physical evil; how or why, we know not; so, however, it is, and it certainly seems proper that this breach should be closed and order restored.”

John Jay (1745–1829) American politician and a founding father of the United States

Letter to (22 August 1774), as published in The Life of John Jay (1833) by William Jay, Vol. 2, p. 345.
1770s, Letter to Lindley Murray (1774)
Context: Among the strange things of this world, nothing seems more strange than that men pursuing happiness should knowingly quit the right and take a wrong road, and frequently do what their judgments neither approve nor prefer. Yet so is the fact; and this fact points strongly to the necessity of our being healed, or restored, or regenerated by a power more energetic than any of those which properly belong to the human mind.
We perceive that a great breach has been made in the moral and physical systems by the introduction of moral and physical evil; how or why, we know not; so, however, it is, and it certainly seems proper that this breach should be closed and order restored. For this purpose only one adequate plan has ever appeared in the world, and that is the Christian dispensation. In this plan I have full faith. Man, in his present state, appears to be a degraded creature; his best gold is mixed with dross, and his best motives are very far from being pure and free from earth and impurity.

“Perhaps that’s why I find myself looking backward. The past has a clarity I can no longer see in the present.”

Kristin Hannah book The Nightingale

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“We go about our daily lives understanding almost nothing of the world. We give little thought to the machinery that generates the sun light that makes life possible, to the gravity that glues us to an Earth that would otherwise sent us spinning off into space, or to the atoms of which we are made and on whose stability we fundamentally depend. Few of us spend much time wondering why nature is the way it is, where the cosmos came from, or whether it was always there, if time will one day flow backwards or whether there are ultimate limits to what humans can know. What is the smallest piece of matter, why we remember the past and not the future, and why there is the universe?”

Carl Sagan (1934–1996) American astrophysicist, cosmologist, author and science educator

[citation needed]
Others

“The past is rich in lessons from which we would greatly profit except that the present is always so full of Special Circumstances.”

Mignon McLaughlin (1913–1983) American journalist

The Complete Neurotic's Notebook (1981), Unclassified

“But if there has been on this earth no real, perfect human life, no love that never cooled, no faith that never failed, which may shine as a loadstar across the darkness of our experience, a light to light amidst all convictions of our own meanness and all suspicions of other's littleness, why, we may have a religion, but we have not a Christianity. For if we lose Him as a Brother, we cannot feel Him as a Saviour.”

Frederick William Robertson (1816–1853) British writer and theologian

Source: Dictionary of Burning Words of Brilliant Writers (1895), P. 55.

“And if we know how to light a fire, why do we carry tinder around with us?"

Because you're humans," the little one explained serenly. "You're stupid.”

Silvana De Mari book The Last Dragon

Source: The Last Dragon

“Why can't reason give greater answers? Why can we throw a question further than we can pull in an answer? Why such a vast net if there's so little fish to catch?”

Yann Martel book Life of Pi

Source: Life of Pi

“Of all the ridiculous expressions people use--and people use a great many ridiculous expressions--one of the most ridiculous is "No news is good news." "No news is good news" simply means that if you don't hear from someone, everything is probably fine, and you can see at once why this expression makes such little sense, because everything being fine is only one of many, many reasons why someone may not contact you. Perhaps they are tied up. Maybe they are surrounded by fierce weasels, or perhaps they are wedged tightly between two refrigerators and cannot get themselves out. The expression might as well be changed to "no news is bad news," except that people may not be able to contact you because they have just been crowned king or are competing in a gymnastics tournament. The point is that there is no way to know why someone has not contacted you, until they contact you and explain themselves. For this reason, the sensible expression would be "no news is no news," except that it is so obvious that it is hardly an expression at all.”

Daniel Handler book The Hostile Hospital

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“Physics is mathematical not because we know so much about the physical world, but because we know so little”

Bertrand Russell (1872–1970) logician, one of the first analytic philosophers and political activist

An Outline of Philosophy Ch.15 The Nature of our Knowledge of Physics (1927)
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Context: Physics is mathematical not because we know so much about the physical world, but because we know so little: it is only its mathematical properties that we can discover.

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Joseph von Fraunhofer7

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