Srimad Bhagavatam Canto 11, Chapter 23, Text 47

SB 11.23.47

mano-vase ’nye hy abhavan sma deva
 manas ca nanyasya vasam sameti
bhismo hi devah sahasah sahiyan
 yuñjyad vase tam sa hi deva-devah
 
Translation: 
 
All the senses have been under the control of the mind since time immemorial, and the mind himself never comes under the sway of any other. He is stronger than the strongest, and his godlike power is fearsome. Therefore, anyone who can bring the mind under control becomes the master of all the senses.
Srimad Bhagavatam Canto 11, Chapter 23, Text 46
Srimad Bhagavatam Canto 11, Chapter 23, Text 48