INTRODUCTION
indriyanam hi caratam
yan mano 'nuvidhiyate
tad asya harati prajnam
vayur navam ivambhasi
tasmad yasya maha-baho
nigrhitani sarvasah
indriyanindriyarthebhyas
tasya prajna pratisthita
Bg 2.68
As a strong wind sweeps away a boat on the water, even one of the roaming senses on which the mind focuses can carry away a man's intelligence. Therefore, O mighty-armed, one whose senses are restrained from their objects is certainly of steady intelligence.
CORRECT TECHNIQUE FOR CONTROLLING THE MIND
Unless