Yeats, W.B.
Vacillation. In : Yeats, W.B. The winding stair and other poems. (London : Macmillan, 1933).
http://classiclit.about.com/library/bl-etexts/wbyeats/bl-wbye-vac.htm.
IV
… A rivery field spread out below,
An odour of the new-mown hay
In his nostrils, the great lord of Chou
Cried, casting off the mountain snow,
"Let all things pass away.'…
[The great lord of Chou : .vermutlich Zhou Gong 11. Jh. v. Chr.]