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“Beauty is pleasure regarded as the quality of a thing.”
Santayana defines beauty as pleasure experienced as though it belonged to the perceived object, making aesthetic value depend on an appreciative response rather than a detached physical property.
Source note: The Sense of Beauty, Part I, §11, “The definition of beauty,” Project Gutenberg #26842. This is Santayana’s historical aesthetic theory of objectified pleasure, not a modern empirical test for whether an object is objectively beautiful.
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“The world is my idea.”
Schopenhauer opens his system by arguing that the experienced world is always presented in relation to a knowing subject, making perception and consciousness conditions of the world as it is known.
Source note: The World as Will and Idea, Vol. I, First Book, §1, Haldane and Kemp translation, Project Gutenberg #38427. “Idea” translates Vorstellung in this historical philosophical vocabulary and should not be read as the everyday sense of a passing thought.
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“Beauty is truth, truth beauty”
The compressed closing formula binds beauty and truth inside the ode’s meditation on art, inviting interpretation rather than offering a settled philosophical definition.
Source note: “Ode on a Grecian Urn,” in Keats: Poems Published in 1820; Project Gutenberg #23684. The words are presented as the urn’s closing message, so the source page preserves the dramatic-poetic framing.
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“A thing of beauty is a joy for ever.”
Keats opens the poem by claiming that beauty can continue to give delight beyond the instant in which it is first encountered.
Source note: Endymion, Book I, opening line; Project Gutenberg #24280. This is a poetic proposition within a Romantic work, not an empirical rule that every aesthetic experience remains pleasurable forever.
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“What is now proved was once only imagined.”
Blake’s proverb compresses a recurring imaginative pattern: possibilities can exist first as conceived ideas before later work, discovery or demonstration makes some of them real or provable.
Source note: The Marriage of Heaven and Hell, “Proverbs of Hell,” represented by Project Gutenberg #45315 at printed page 16. Gutenberg regularizes the line to “imagined”; Blake’s engraved text is often transcribed with historical spelling and punctuation. The proverb is part of Blake’s deliberately paradoxical infernal-wisdom sequence, not a literal claim that every imagined thing will eventually be proved.
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“We shall never learn the affinities of beauty”
Stevenson treats beauty as deeper than any complete technical explanation, warning that analysis of artistic mechanism does not exhaust why form can move or delight.
Source note: Essays in the Art of Writing, “On Some Technical Elements of Style in Literature,” represented by the 1905 Chatto & Windus edition in Project Gutenberg #492. The collection is posthumous; the excerpt concerns literary aesthetics.