Part of the Numbers in Thelema series.
From Liber L vel Legis
Sub figura XXXI:
"My prophet is a fool with his one one
one; are not they the Ox and none
by the Book."
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This may not actually refer to 111, but 1-1-1. The ox is the aleph, the value of which is 1; the book is threefold, so 1 "by the Book" might be 1-1-1, in the manner of reflection, not addition.