Dhyana (Meditation)
Dhyana (meditation) According to the Hindu Yoga Sutra, written by Patanjali, Dhyana (meditation) is one of the eight limbs of Yoga, (the other seven being Yama, Niyama, Asana, Pranayama, Pratyahara, Dharana, and Samādhi). According to Patanjali, the founder of yoga philosophy, the final stage of meditation in dhyāna is considered to be jhāna. At this stage of meditation, one does not see it as a meditational practice, but instead merges with the idea and thought. One cannot reach a higher stage of consciousness without jhāna.
The entire Eight Limbs of the Patanjali system are also sometimes referred to as Dhyana, or the meditative path, although strictly speaking, only the last four limbs constitute meditation Pratyahara, Dharana, Dhyana, and Samādhi. The preceding steps are only to prepare the body and mind for meditation.
In the Ashtanga ("eight limbs") Yoga of Patanjali, the stage of meditation preceding dhyāna is called dharana. In Dhyana, the meditator is not conscious of the act of meditation (i.e. is not aware that s/he is meditating) but is only aware that s/he exists (consciousness of being), and aware of the object of meditation. Dhyana is distinct from Dharana in that the meditator becomes one with the object of meditation. He/she is then able to maintain this oneness for 144 inhalations and expiration.
Dhyana, practiced together with Dharana and Samādhi constitutes the Samyama.