I need a bit of help with a Yeats reference

[pagebypage]

Richard Weaver in his essay, Up From Liberalism starts with this sentence:
"There is a saying by William Butler Yeats that a man begins to understand the world by studying the cobwebs in his own corner."

I thought that I have a reasonable familiarity with Yeats yet I find I can't track down the reference in his work. A bit of help would greatly be appreciated. Perhaps the citation is not as direct as I am expecting?

[quasimodo1]

To pagebypage: You won't find this in Yeats' work; it is, possibly, a quotation or remark from other writings.

[pagebypage]

To pagebypage: You won't find this in Yeats' work; it is, possibly, a quotation or remark from other writings.

I was thinking it was just a misquote but I wasn't sure. I thought I had all of Yeats' works but you never know. Thanks, quasimodo1.