There are many techniques of meditation in the Gnostic tradition, each with its corresponding purpose. In general, they will apply to one of the following stages:
The Gnostic must first attain the ability to stop the course of his thoughts, the capacity to not think. Indeed, only the one who achieves that capacity will hear the Voice of the Silence.
When the Gnostic disciple attains the capacity to not think, then he must learn to concentrate his thoughts on only one thing.
The fourth step is contemplation, ecstasy or Samadhi. This is the state of Turiya (perfect clairvoyance). - Samael Aun Weor, The Perfect Matrimony
In other words, to work successfully with any practice of meditation, it must take into account these essential stages. It is impossible to skip stages. That is, if one cannot silence the mind (stage one), then one can never enter Samadhi (stage four).
To learn about meditation, we offer:
"It is only in the absence of the “I” that one can experience the bliss of the Being. Only in the absence of the “I” can ecstasy be attained."