Source identified1
“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.
Source identified2
“Then glut thy sorrow on a morning rose”
The poem directs sorrow toward something vividly beautiful and temporary, bringing grief into contact with immediate sensory life instead of treating beauty and sadness as opposites.
Source note: “Ode on Melancholy,” in Keats: Poems Published in 1820; Project Gutenberg #23684. This is Romantic poetic imagery and not mental-health treatment advice.
Source identified3
“The poetry of earth is never dead.”
Seasonal change does not extinguish natural life; the poem hears a continuing voice in both summer and winter.
Source note: On the Grasshopper and Cricket, opening line.
Source identified4
“The poetry of earth is ceasing never.”
Keats closes the sonnet by insisting that nature’s music changes performers with the seasons but never truly stops.
Source note: On the Grasshopper and Cricket, final line; the cricket continues the earth’s poetry in winter.
Source identified5
“Season of mists and mellow fruitfulness”
Keats begins by finding abundance and beauty in the atmosphere of autumn, treating seasonal maturity as worthy of attention in its own right.
Source note: “To Autumn,” in Keats: Poems Published in 1820; Project Gutenberg #23684. The phrase opens a poem whose imagery follows ripening, harvest and the sounds of the season.
Source identified6
“Think not of them, thou hast thy music too”
Instead of measuring autumn only against spring, the poem redirects attention to the distinct music of the season that is actually present.
Source note: “To Autumn,” final stanza, in Keats: Poems Published in 1820; Project Gutenberg #23684. The line follows the question “Where are the songs of Spring?” and answers by valuing autumn’s own sounds.