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| * Man is most nearly himself when he achieves the seriousness of a child at play. | | * Man is most nearly himself when he achieves the seriousness of a child at play. |
| + | :Usually attributed, incorrectly, to Heraclitus (c. 535–c. 475 BCE) |
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− | :Usually attributed, incorrectly, to Heraclitus (c. 535–c. 475 BCE) | + | * I cannot teach anybody anything. I can only make them think. |
| + | :Attributed to Socrates (c. 469 BCE–399 BCE), but no source is provided. |
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| * Make it your business to know yourself, which is the most difficult lesson in the world. | | * Make it your business to know yourself, which is the most difficult lesson in the world. |
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| * A society grows great when old men plant trees in whose shade they know they shall never sit. | | * A society grows great when old men plant trees in whose shade they know they shall never sit. |
| :Allegedly a Greek proverb, but no source is provided. | | :Allegedly a Greek proverb, but no source is provided. |
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| + | * Everything should be made as simple as possible, but ''no simpler''. |
| + | :Attributed to Albert Einstein (1879–1955), but no source is provided. |
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| ==Aristotle (384 BCE–322 BCE)== | | ==Aristotle (384 BCE–322 BCE)== |