हठयोग प्रदीपिका (योगी स्वात्माराम - ज्योत्स्ना टीका सहित सटीक)

HAṬHAYOGAPRADĪPIKĀ 21
63. The Yogin should take nourishing and sweet
food mixed with ghee and milk, etc.; it should nourish
the dhātu-s, and be pleasing and suitable.
The Yogin can use buffalo's milk if he cannot get pure cow's
milk. He can take various sorts of cakes that are nutritious
and pleasing.
The dhātu-s are seven in number. They are chyle, flesh,
blood, bones, marrow, fat and semen.
64. Any person who is not lethargic in the pursuit
of different forms of Yoga, attains siddhi through practice,
be he young, old or even very old, sickly or weak.
65. One who is intent on practice will obtain
siddhi, not one who is idle. Yoga-siddhi is not obtained
by a mere reading of the Śāstra-s.
66. Siddhi is not achieved by wearing the dress
[of a Yogin], or by talking about it; practice alone is
the cause of success. This is the truth, without doubt.
67. The Āsana-s, the different Kumbhaka-s, and
the excellent Karaṇa-s [positions like the Mahāmudrā]
are all, in the course of Haṭha-yoga, to be practised
till the fruit of Rāja-yoga is obtained.