“Empires dissolve and peoples disappear,
Song passes not away.”
Lacrymae Musarum, reported in Bartlett's Familiar Quotations, 10th ed. (1919).
Sir William Watson was an English poet, popular in his time for the celebratory content, and famous for the controversial political content, of his verse. Initially popularly recognised, he was then neglected because of changing tastes. Wikipedia

“Empires dissolve and peoples disappear,
Song passes not away.”
Lacrymae Musarum, reported in Bartlett's Familiar Quotations, 10th ed. (1919).
“Hate and mistrust are the children of blindness”
England to Ireland, reported in Bartlett's Familiar Quotations, 10th ed. (1919).
World-Strangeness, reported in Bartlett's Familiar Quotations, 10th ed. (1919).
“And though circuitous and obscure
The feet of Nemesis how sure!”
Europe at the Play, reported in Bartlett's Familiar Quotations, 10th ed. (1919).
The Great Misgiving http://www.poemhunter.com/poem/the-great-misgiving/.
“O be less beautiful, or be less brief.”
"Autumn" http://books.google.com/books?id=YjFKAAAAMAAJ&q=%22O+be+less+beautiful+or+be+less+brief%22&pg=PA4#v=onepage, Poems (1892).
“Braying of arrogant brass, whimper of querulous reeds.”
Hymn to the Sea, Part iii, 8, reported in Bartlett's Familiar Quotations, 10th ed. (1919).
“Best they honor thee
Who honor in thee only what is best.”
The true Patriotism, reported in Bartlett's Familiar Quotations, 10th ed. (1919).
World-Strangeness, reported in Bartlett's Familiar Quotations, 10th ed. (1919).
“April, April,
Laugh thy girlish laughter;
Then, the moment after,
Weep thy girlish tears!”
April http://www.recmusic.org/lieder/get_text.html?TextId=22188 (1897).
“Deemest thou labor
Only is earnest?
Grave is all beauty,
Solemn is joy.”
England my Mother, Part iv, reported in Bartlett's Familiar Quotations, 10th ed. (1919).
England and Her Colonies http://www.poemhunter.com/poem/england-and-her-colonies/.