Israel Regardie 
Foundations of Practical Magic [PDF ebook] 
An Introduction to Qabalistic, Magical and Meditative Techniques

These essays, now revised and brought together, represent the fruit of a lifetime’s study and experience of occult techniques. The emphasis throughout is on practical methods of releasing the vast inner potential on which magic depends, with the aim of finding ‘the jewel of a new life’ — a life full of creative possibilities based on a radical renewal of consciousness.