On concentration
Yoga Sutras 1.2
Source: verified public-domain translation.
Original text
योगश्चित्तवृत्तिनिरोधः ॥
Transliteration
yogaś citta-vṛtti-nirodhaḥ
Translation
“Yoga is the restraint of the modifications of the mind-stuff.”
Translation · Swami Vivekananda
Context
The definition-sutra of Patanjali. Vivekananda's 1896 English ('mind-stuff') is interpretive. Later scholars debate nirodha: cessation, stilling, or governing.