Source: Persecution and the Art of Writing (1952), How to Study Spinoza's Theologico-Political Treatise, p. 144
“He will learn to observe carefully, and not to be deceived, as we sometimes are, by appearances.”
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 Long 66
English classical scholar 1800–1879Related quotes

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.”
The Wolf in Sheep's Clothing.

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.
“Appearances are very often both convincing and deceiving.”
Il Capello Parlante, Act III, Sc. I. — (Lancourt).
Translation reported in Harbottle's Dictionary of quotations French and Italian (1904), p. 351.

“Appearances can easily deceive anyone except a blind person.”

Source: De architectura (The Ten Books On Architecture) (~ 15BC), Book III, Chapter I, Sec. 1