dhyānayoga - Verse śloka 26
śloka 26
yato yato niścarati manaścañcalamasthiram |
tatastato niyamyaitadātmanyeva vaśaṃ nayet ||6-26||
Translation
Whatever causes this restless and unsteady mind to wander—by restraining those, the aspirant should bring it under the control of the Self alone.