योगश्चित्तवृत्तिनिरोधः ॥२॥
yogaś-citta-vṛtti-nirodhaḥ ||2||

[RS] 1.2 When you are in a state of yoga, all misconceptions (vrittis) that can exist in the mutable aspect of human beings (chitta) disappear.

[JW] 1.2 Yoga is the restriction of the fluctuations of mind stuff.

[SS] 1.2 The restraint of the modifications of the mind-stuff is Yoga. [p3]

[TD] 1.2 Yoga is the ability to direct the mind exclusively toward an object and sustain that direction without any distractions. [p149]

[EB] 1.2 Yoga is the stilling of the changing states of the mind. [p10]

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JHT:  RS is again more interpretive. JW has a long 5 pages of commentary and explanation.

The modifications are restrained, not eliminated.

Is there unmodified mind-stuff?

How is the mind-stuff different than the mind?

There are thoughts (citta) and then modifications (vrtti), is there an unmodified state of thoughts?

(योगः, yogaḥ) = yoga
(चित्त, citta) = all that is mutable in human beings; thoughts
(वृत्ति, vṛtti) = thought-wave; mental modification; mental whirlpool
(निरोधः, nirodhaḥ) = to find tranquility; to control