In plain words
Prāṇāyāma, pratyāhāra, inquiry with Viveka into the eternal and the transient, the way of samādhi joined with japa: give heed, give great heed.
Prāṇāyāma, pratyāhāra, inquiry with Viveka into the eternal and the transient, the way of samādhi with the mantra: practise these with care and without wavering.
Students, embodiments of the divine Ātma!
The spiritual path is like playing with fire, like fighting a tiger. At the slightest lapse of attention, Māyā, lying in wait, drags a man into the thicket called saṃsāra, throws him into confusion, and sets about making him forget his very humanness. That being so, before a man enters the spiritual path, it is essential that he recognise the special value of prāṇāyāma and pratyāhāra. Sādhanas are of two kinds: inner sādhana and outer sādhana. We have śravaṇa, manana and nididhyāsa, and along with them the paths called śravaṇa, kīrtana, smaraṇa, pādasevana, vandana, arcana, dāsya, sneha and ātmanivedana: all of these prove to be outer sādhanas. But prāṇāyāma and pratyāhāra alone are inner sādhanas.
The practice of prāṇāyāma is precisely the restraint of the prāṇa. There are five prāṇas in man. Prāṇa, apāna, vyāna, udāna and samāna. The special value of prāṇāyāma lies in setting out to restrain these five prāṇas and, through that, to develop inner vision of many kinds. In this prāṇāyāma there are three kinds: recaka, pūraka and kumbhaka.