Sutra 2.53: dharanasu cha yogyata manasa
- dharanasu = for concentration (dharana)
- cha = and
- yogyata = qualification, ability, capability, eligible, fitness, preparation
- manasa = mental, spiritual, the mind/thought principle, belonging to mind or spirit
Translated loosely into English;
And (the practices of pranayama) prepares the mind and spirit for concentration.
Clarification of the mind is achieved with pranayama. By practicing regulating the breath, creating a greater awareness of prana through Pranayama (4th limb), as Patanjali has suggested in the previous Sutras, the mind has the ability for deep concentration, Dharana, (6th limb).
The first four limbs ensure that the student is truly ready and prepared for the deeper stages of Yoga. Without these practices, it is questionable as to whether or not the student is ready.
The 8 Limbs are again;
Yama, Niyama, Asana, Pranayama, Pratyahara, Dharana, Dhyana, Samadhi.