“He will learn to observe carefully, and not to be deceived, as we sometimes are, by appearances.”

— George Long

An Old Man's Thoughts on Many Things, Of Education I
Context: Could not a boy be taught the elements of astronomy at the sole cost of using his eyes and his brain; taught slowly, certainly, and not wearied with too much at once? Some would learn more than others; but all would learn something. This is real science, real knowledge, which will make a boy wiser, and probably better too. He will learn to observe carefully, and not to be deceived, as we sometimes are, by appearances.

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George Long66

English classical scholar 1800–1879

Leo Strauss book Persecution and the Art of Writing

Source: Persecution and the Art of Writing (1952), How to Study Spinoza's Theologico-Political Treatise, p. 144

“Carefully observe oneself and one's situation, carefully observe others, and carefully observe one's environment”

Kanō Jigorō (1860–1938) Japanese educator and judoka

Budo Secrets (2002)
Context: Jigoro Kano's Five Principles of Judo:
1. Carefully observe oneself and one's situation, carefully observe others, and carefully observe one's environment,
2. Seize the initiative in whatever you undertake,
3. Consider fully, act decisively,
4. Know when to stop,
5. Keep to the middle.

“Appearances often are deceiving.”

Aesop (-620–-564 BC) ancient Greek storyteller

The Wolf in Sheep's Clothing.

“Correct and accurate conclusions may be arrived at if we carefully observe the relation of the spheres of concepts”

Arthur Schopenhauer book The World as Will and Representation

Vol. I, Ch. 10, as translated by R. B. Haldane
The World as Will and Representation (1819; 1844; 1859)
Context: Correct and accurate conclusions may be arrived at if we carefully observe the relation of the spheres of concepts, and only conclude that one sphere is contained in a third sphere, when we have clearly seen that this first sphere is contained in a second, which in its turn is contained in the third. On the other hand, the art of sophistry lies in casting only a superficial glance at the relations of the spheres of the concepts, and then manipulating these relations to suit our purposes, generally in the following way: — When the sphere of an observed concept lies partly within that of another concept, and partly within a third altogether different sphere, we treat it as if it lay entirely within the one or the other, as may suit our purpose.

“Observers are men, animals, or machines able to learn about their environment and impelled to reduce their uncertainty about the events which occur in it, by dint of learning… [We] shall examine human observers who, because we have an inside understanding of their observational process, belong to a special category. For the moment, we shall not bother with HOW an observer learns, but will concentrate upon WHAT he learns about, i. e. what becomes more certain.”

Gordon Pask (1928–1996) British psychologist

Source: An Approach to Cybernetics (1961), p. 18.

“Appearances are very often both convincing and deceiving.”

Camillo Federici (1749–1802) Italian actor and playwright (1749-1802)

Il Capello Parlante, Act III, Sc. I. — (Lancourt).
Translation reported in Harbottle's Dictionary of quotations French and Italian (1904), p. 351.