Yoga citta vritti nirodhah
(Pantajali Sutras Chapter 1, v. 2)
Yoga is the resolution of the agitations of the mind
Yama niyama asana pranayama pratyahara dharana dhyana samadhayo’ stavangani
(Pantajali Sutras Chapter 11, v. 29)
The practice of restraint, observances, posture, breath control, withdrawal from the senses, concentration, meditation and samadhi are the eight-fold path of yoga.