Yeats reference?

The Second Coming, stanza 1

Turning and turning in the widening gyre
The falcon cannot hear the falconer;
Things fall apart; THE CENTER CANNOT HOLD;
Mere anarchy is loosed upon the world,
The blood-dimmed tide is loosed, and everywhere
The ceremony of innocence is drowned;
The best lack all conviction, while the worst
Are full of passionate intensity.