Meditation found in Liber HHH, which is particularly refered to the Zelator.
Rhythmic breathing and relaxation. After about 15 minutes, the letter is suddenly showed in silver color on a black background which eventually receives the dark blue color of the night sky.
Take the posture of a dead man. Imagine Yourself in a form of Pylon: sing a "mantra": "AKA DUA..."
Enter the Temple (Temple has a four Gates - Ra, Ahathoor, Tum & Kephra). Go to the Center of Temple, You see the four stations of the Sun - feel it, sense its force - You are becoming a Star in the Center.
While inhaling concentrate on the point in Your heart; while exhaling concentrate on a Sphere around Yourself; with every exhalation it is getting larger in geometric progression - becoming Endless.
Visualize the shining circle around the working space, and the shining point in the middle of your heart. Meditate on the image of Nuit as a woman in a blue-gold dress who holds the lotus-wand and an ankh.
A particular method for destroying the thoughts.
Observe the sick creations of your mind. Watch your thoughts. Destroy them!