What do you think it means to have “a mind of winter” and “not to think / Of any misery in the sound of the wind, / In the sound of a few leaves”? What would the snow man be doing if he did think of “misery” in those things? The poem is all one sentence; why do you think Stevens did that? Why do you think he repeats “nothing” three times in the final stanza?
The Snow Man
by Wallace Stevens
One must have a mind of winter
To regard the frost and the boughs
Of the pine-trees crusted with snow;
And have been cold a long time
To behold the junipers shagged with ice,
The spruces rough in the distant glitter
Of the January sun; and not to think
Of any misery in the sound of the wind,
In the sound of a few leaves,
Which is the sound of the land
Full of the same wind
That is blowing in the same bare place
For the listener, who listens in the snow,
And, nothing himself, beholds
Nothing that is not there and the nothing that is.
Wallace Stevens, "The snow man" from Harmonium. (New York: Alfred A. Knopf, 1923. Public domain.)