One of the interesting (to me) references from Updike's recent obituraries was the fact that when at Harvard he applied several times (but never successfully) to take Macleish's advanced writing course. To maybe understand this failure, compare any of Updike's prose to the following poem of Macleish. It is called Ars Poetica, but if you use your imagination you could think of it as Ars du Golf.....
Leaving, as the moon releases
Twig by twig the night-entangled trees,
Leaving, as the moon behind the winter leaves,
Memory by memory the mind -
A poem should be motionless in time
As the moon climbs
A poem should be equal to:
Not true
For all the history of grief
An empty doorway and a maple leaf
For love
The leaning grasses and two lights above the sea -
A poem should not mean
But be