and how we may interrupt any sériés so as to express our idea by 
means of structure. 
The general rule is that a single knock has no spécial significance 
as such, because unity is omniform. It represents Kether, which 
is the source of ail things equally without partaking of any quality 
by which we discriminate one thing from another. Continuing on 
these lines, the number of knocks will refer to the Sephira or other 
idea Qabalistically cognate with that number. Thus, 7 knocks 
will intimate Venus, 11 the Great Work, 17 the Trinity of Fathers, 
and 19 the Féminine Principle in its most general sense. 
Analyzing the matter a little further, we remark firstly that a 
battery of too many knocks is confusing, as well as liable to over- 
weight the other parts of the ritual. In practice, 11 is about the 
limit. It is usually not difficult to arrange to cover ail necessary 
ground with that number. 
Secondly, each is so extensive in scope, and includes aspects so 
diverse from a practical standpoint that our danger lies in 
vagueness. A knock should be well definedj its meaning should 
be précisé. The very nature of knocks suggests smartness and 
accuracy. We must therefore devise some means of making the 
sequence significant of the spécial sense which may be appropriate. 
Our only resource is in the use of intervals. 
It is evidently impossible to attain great variety in the smaller 
numbers. But this fact illustrâtes the excellence of our system. 
There is only one way of striking 2 knocks, and this fact agréés 
with the nature of Chokmah; there is only one way of creating. 
We can express only ourselves, although we do so in duplex form. 
But there are three ways of striking 3 knocks, and these 3 ways 
correspond to the threefold manner in which Binah can receive 
the créative idea. There are three possible types of triangle. We 
may understand an idea either as an unity tripartite, as an unity 
dividing itself into a duality, or as a duality harmonized into an 
unity. Any of these methods may be indicated by 3 equal knocks $ 
1 followed, after a pause, by 2; and 2 followed, after a pause, by 1. 
As the nature of the number becomes more complex, the 
possible varieties increase rapidly. There are numerous ways of 
striking 6, each of which is suited to the nature of the several 
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