Duality is never perceived when the mind ceases to act. (amani-bhava)
The mind, after realizing the knowledge that Atman alone is real, becomes free from imaginations. (atma-satya)
The immutable and birthless Brahman is the goal of knowledge. The birthless is known by the birthless. (akalpakam-ajam jnanam)
The mind which, being endowed with discrimination and free from illusions, is under control. (nigrhitasya manaso)
The controlled mind is verily the fearless Brahman. (brahma jnan-alokam)
Brahman is birthless, sleepless, dreamless, nameless, and formless. (ajam-anidram-asvapnam-anamakam-arupakam)
Atman is beyond all expression by words, and beyond all acts of the mind. (sarva)
Brahman is free from mental activity and hence from all ideas of acceptance or relinquishment. (jnanam-ajati)
This yoga, which is not in touch with anything, is hard for yogis in general to attain. (asparsa-yogo)
~K3,31-39 (tr-Nik.)
A Commentary on 31-33
Duality is dependent on the mind. When mind is no-mind, there is no duality. Mind becomes no-mind not through yogic effort but by the knowledge of Atman being realized. This knowledge of Brahman is the goal of nonduality. And this unborn truth is only known by this unborn truth.
Nikhilanada's complete translation
31 All the multiple objects, comprising the movable and the immovable, are perceived by the mind alone. For duality is never perceived when the mind ceases to act.
32 When the mind, after realizing the knowledge that Atman alone is real, becomes free from imaginations and therefore does not cognize anything, for want of objects to be cognized, it ceases to be the mind.
33 Knowledge (Jnana), which is unborn and free from imagination, is described [by the wise] as ever inseparable from the knowable. The immutable and birthless Brahman is the goal of knowledge. The birthless is known by the birthless.
34 One should know the behaviour of the mind which, being endowed with discrimination and free from illusions, is under control. The condition of the mind in deep sleep is not like that but is of a different kind.
35 The mind is withdrawn in deep sleep, but it is not so when the mind is controlled. The controlled mind is verily the fearless Brahman, the light of whose omniscience is all-pervading.
36 Brahman is birthless, sleepless, dreamless, nameless, and formless. It is ever effulgent and omniscient. No duty, in any sense, can ever be associated with It.
37 Atman is beyond all expression by words, and beyond all acts of the mind. It is great peace, eternal effulgence, and samadhi; It is unmoving and fearless.
38 Brahman is free from mental activity and hence from all ideas of acceptance or relinquishment. When knowledge is established in Atman it attains birthlessness and sameness.
39 This yoga, which is not in touch with anything, is hard for yogis in general to attain. They are afraid of it, because they see fear in that which is really fearlessness.