Dvivedi, Manilal Nabhubhai [Komm.]: The Yoga-sūtra of Patanjali: (translation, with introduction, appendix, and notes based upon several authentic commentaries) (Bombay, 1890)

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XLV. From resignation to Iivara (follows) the
accomplishment of Samddhi.

The meaning is sufficiently plain, if we bear in mind the
fall import of the phrase 'resignation to I&vara.'

XLVI. Posture is that which is steady and easy.

Having described Yama and JSh/ania, the first two accessories
of Yoga, it is proposed to describe the third, A'sana or posture.
Though numerous variations of the mode of keeping the body
in position at the time of performing Yoga are given in
different books, the general and most convenient definition of
posture is that it should be perfectly steady and should cause
no painful sensation, never mind what shape it takes. (For
further particulars see Appendix.)

XLVII. By mild effort and meditation on the
endless.

This aphorism must be read as a part of the preceding.
Posture is that which is steady and easy, being so made, by
mild effort and meditation on the endless. All violent effort in
assuming any particular posture leads to pain and therefor*
unsteadiness. By slow and mild effort any kind of posture
will be acquired as a habit, and it will be easy to assume that
posture at a moment's thought, as also to remain in it for a
long period of time. After any posture is assumed, it is good
to sever our thought entirely from the posture and fix it
upon the infinite, say akasa or Ikmra or, as some copies have
it, the Ananta, meaning, the great serpent that is believed
to uphold the earth, &c. These conditions will render the
posture entirely painless.