Bhagavad-gītā 6.26
BG 6.26
Open the full passageयतो यतो निश्चरति मनश्चञ्चलमस्थिरम् । ततस्ततो नियम्यैतदात्मन्येव वशं नयेत् ॥२६॥
Sanskrit
yato yato niścalati manaś cañcalam asthiram tatas tato niyamyaitad ātmany eva vaśaṁ nayet
Translation
From wherever the mind wanders due to its flickering and unsteady nature, one must certainly withdraw it and bring it back under the control of the self.