Yōga Sūtra 4.25

विशेषदर्शिन आत्मभावभावनाविनिवृत्तिः।

viśēṣadarśina ātmabhāvabhāvanāvinivr̥ttiḥ।

[विशेष दर्शिन आत्मभाव भावना विनिवृत्तिः।
viśēṣa = special; darśina = ability to observe; ātmabhāva = feeling of; bhāvanā = emotions; vinivr̥ttiḥ = are subdued;]

With that special ability to observe, the feeling of I and other emotions are subdued.