64 
Magical Power 
Cara Soror, 
Do what thou wilt shall be the whole of the Law. 
Rightly you remark that most of these letters have dealt 
with self-development in one form or another; now, what of 
the causa finalis. the "practical angle" some would call it. 
What you want now is to learn how to apply the knowledge 
and power that you have gained to the execution of your 
True Will, to the accomplishment of the Great Work. 
Obviously, much must be left to your own common-sense ; 
the one technical point on which I insist above all others is 
the Magical Link. 
You must lay to heart Magick, Chapter XIV (pp. 106-122) 
and never forget one detail. More failure comes from neglect 
of this than from all other causes put together. Most of the 
qualities that you need are inborn; all the material is to your 
hand ; and to develop them is a natural process, equally your 
birthright. But the making of the Link is an intellectual, even 
mechanical, 
task; success depends on purely objective 
considerations . 
That granted, there are perhaps a few hints. Firstly, while 
of course 
the Magical Theory supposes a kind of 
omnipotence, please remember that Magick is Science, that 
the Laws of Nature remain the same, however subtle may be 
the material with which one is working. It is, to put it 
brutally, a bigger miracle to destroy a fortress than an easy 
chair. You know this well enough; but the corollary is that it 
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