83 
Epistola Ultima 
Cara Soror, 
Do what thou wilt shall be the whole of the Law. 
The suggestion in your last letter to me is a very sensible 
one. I do think that people in general would like to get some 
idea of my system of training as a whole, in a comprehensive 
form. In the past there has been far too much of referring 
them to one quite unprocurable 
document and then to 
another which probably has not even been written. No 
wonder that they go away sorrowful. So I am going to put in 
as the last of this series of Letters an account, as clear and as 
succinct as the gods enable me to do, of what they may 
expect to have to do to get good marks from Grandfather. Of 
course I shall not be able to avoid altogether reference to the 
various official documents , but I will make these as short and 
as few as I can. 
First of all then , my system can be divided into two parts. 
Apparently diametrically opposed, but at the end converging, 
the one helping the other until the final method of progress 
partakes equally of both elements. 
For convenience I shall call the first method Magick, and 
the second method Yoga. The opposition between these is 
very plain for the direction of Magick is wholly outward, that 
of Yoga wholly inward. 
I will deal first then with Magick. How do I define this 
word? 
Magick is the science and art of causing change to occur in 
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