Patanjali Yoga Sutra 1.12

Sanskrit Sutra

अभ्यासवैराग्याभ्यां तन्निरोधः॥१२॥

Swami Vivekananda's translation

Their control is by practice and non-attachment.

Vyasa Bhashya (Sanskrit)

अथाऽऽसां निरोधे क उपाय इति –

अभ्यासवैराग्याभ्यां तन्निरोधः ॥ १२ ॥

चित्तनदी नामोभयतोवाहिनी वहति कल्याणाय वहति पापाय च। या तु कैवल्यप्राग्भारा विवेकविषयनिम्ना सा कल्याणवहा। संसारप्राग्भाराऽविवेकविषयनिम्ना पापवहा। तत्र वैराग्येण विषयस्रोतः खिलीक्रियते। विवेकदर्शनाभ्यासेन विवेकस्रोत उद्धाट्यत इत्युभयाधीनश्चित्तवृत्तिनिरोधः ॥ १२ ॥

Vyasa Bhashya (English Translation)

Now, what is the means for their (modifications’) restriction? By practice (abhyasa) and detachment (vairagya), their restriction is achieved. || 12 || The river of the mind (citta-nadi) indeed flows in both directions: it flows towards good (kalyana) and it flows towards evil (papa). That which is inclined towards liberation (kaivalya) and flows in the channel of discriminative knowledge (viveka) is the one flowing towards good. That which is inclined towards worldly existence (samsara) and flows in the channel of non-discrimination (aviveka) is the one flowing towards evil. Therein, the stream of objects is blocked by detachment (vairagya). The stream of discrimination is opened up by the practice (abhyasa) of discriminative vision. Thus, the restriction of the mental modifications is dependent on both.

The Two Flows of the River of Mind (Citta-Nadi)

Flow Direction	Inclined Towards	Channel (Srota)	Handled By
Towards Good (Kalyana)	Liberation (Kaivalya)	Discriminative Knowledge (Viveka)	Opened by Practice (Abhyasa)
Towards Evil (Papa)	Worldly Existence (Samsara)	Non-discrimination (Aviveka)	Blocked by Detachment (Vairagya)

Chapter link: Yoga Sutra Chapter 1