Another key element to Thelemic mysticism is the ability to concentrate. This skill has two modalities: the first is the rapid, accurate, and efficient movement of thought (which is the realm of magick) and the other is the stopping of thought altogether (which is accomplished in Yoga). In the first, it is the Manipulation of all ideas into one idea, and in the second is the taking of that one thought and reducing it to nothing. Of this skill, Crowley writes:
For concentration does indeed unlock all doors; it lies at the heart of every practice as it is of the essence of all theory; and almost all the various rules and regulations are aimed at securing adeptship in this matter. All the subsidiary work — awareness, one-pointedness, mindfulness and the rest — is intended to train you to this.
Concentration is essentially the prerequisite for all sustained success, not only in spiritual practices, but in day-to-day life as well. The general program for developing concentration is borrowed almost completely from the practice of Yoga within the Hindu and Buddhist systems. Crowley gives a general overview of the Techniques in two books: Eight Lectures on Yoga and in the section called "Mysticism" in his opus, Magick (Book 4).
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Max Heindel - Ancient And Modern InitiationConfucius - Confucian Canon
Aleister Crowley - International