"Be still"

"O SWEET everlasting Voices, be still;
Go to the guards of the heavenly fold
And bid them wander obeying your will
Flame under flame, till Time be no more;
Have you not heard that our hearts are old,
That you call in birds, in wind on the hill,
In shaken boughs, in tide on the shore?
O sweet everlasting Voices, be still."

William Butler Yeats (13/06/1865 – 28/01/1939)