Vacillation William Butler Yeats

I

Between extremities
Man runs his course;
A brand, or flaming breath,
Comes to destroy
All those antinomies
Of day and night;
The body calls it death,
The heart remorse.
But if these be right
What is joy?

II

A tree there is that from its topmost bough
Is half all glittering flame and half all green
Abounding foliage moistened with the dew;
And half is half and yet is all the scene;
And half and half consume what they renew,
And he that Attis' image hangs between
That staring fury and the blind lush leaf
May know not what he knows, but knows not grief

III