Platón

"The saying is true, Socrates, that beautiful things are difficult." (435C)

"Anything big risks a fall, and as the saying goes, beautiful things are hard by their very nature." (497D)

"I said, 'what do you imagine he thinks of the other pleasures in comparison to that of knowing the truth as it is and always being in a condition like that while he's learning?'" (581E)

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República, Platón (J. Sachs, trad.).