Part of the Numbers in Thelema series.
From Liber L vel Legis
Sub figura XXXI:
"Nothing is a secret key of this law
one; Sixty-one the Jews call it; I call it
eight, eighty, four hundred & eighteen."
This may be a transcription error: "61" instead of "60 to 1."
"The Jews" use the ratio 60:1 as a rule of thumb for nullification, but this nullification is one of dissolution, of becoming anonymous in a crowd.