अभ्यासवैराग्याभ्यां तन्निरोधः ॥१२॥
abhyāsa-vairāgya-ābhyāṁ tan-nirodhaḥ ||12||

[RS] 1.12 The state of yoga is attained via a balance between assiduousness (abhyasa) and imperturbability (vairagya).

[JW] 1.12 The restriction of them is by [means of] practice and passionlessness.

[SS] 1.12 These mental modifications are restrained by practice and non-attachment. [p18]

[TD] 1.12 The mind can reach the state of Yoga through practice and detachment. [p153]

[EB] 1.12 [The vrtti states of mind] are stilled by practice and dispassion. [p47]

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(अभ्यास, abhyāsa) = assiduousness; cheerfulness; practice
(वैराग्य, vairāgya) = imperturbability; indifference
(आभ्यां, ābhyāṁ) = both
(तन्, tan) = this
(निरोध, nirodha) = tranquility; tranquility of all mutable things, i.e. attaining the state of yoga.