“The light would reach us more quickly in the morning and fade more slowly at night if the whole earth were divided into vast flower beds that called forth the light at dawn and clutched it longer at nightfall. Nature instituted summer for flowers long before man took summer over for his own uses.”

"To my mother" [Meiner Mutter] (May 1920), trans. John Willett in Poems, 1913-1956, p. 49
Poems, 1913-1956 (1976)

Source: The Picture of Dorian Gray

Éstas que fueron pompa y alegría
despertando al albor de la mañana,
a la tarde serán lástima vana
durmiendo en brazos de la noche fría.
A las flores ("Éstas, que fueron pompa y alegría") http://es.wikisource.org/wiki/A_las_flores_%28Calder%C3%B3n_de_la_Barca%29.

Bed in Summer, st. 1.
A Child's Garden of Verses (1885)

St. 1
Hymn to Intellectual Beauty (1816)
Context: The awful shadow of some unseen Power
Floats though unseen among us; visiting
This various world with as inconstant wing
As summer winds that creep from flower to flower;
Like moonbeams that behind some piny mountain shower,
It visits with inconstant glance
Each human heart and countenance;
Like hues and harmonies of evening,
Like clouds in starlight widely spread,
Like memory of music fled,
Like aught that for its grace may be
Dear, and yet dearer for its mystery.

Source: The Glass Castle

Love is Enough (1872), Song III: It Grew Up Without Heeding

Source: The Picture of Dorian Gray

Canto I, stanza 18.
The Lady of the Lake http://www.gutenberg.org/etext/3011 (1810)