Mahabharata 3.202.22

3.202.22

ṣaṇṇāmātmani nityānāmindriyāṇāṃ pramāthinām |
yo dhīro dhārayedraśmīnsa syātparamasārathiḥ || 22 ||

This subjugation of the senses is the highest means of attaining spiritual light. Our senses are at the (cause) root of our spiritual advancement as also at the root of our spiritual degradation. By indulging in them, a person undoubtedly contracts vices, and by subduing these, he attains salvation. The self-restrained person who acquires mastery over the six senses inherent in our nature, is never tainted with sin, and consequently evil has no power over him. Man's corporeal self has been compared to a chariot, his soul to a charioteer and his senses to horses. A dexterous man drives about without confusion, like a quiet charioteer with well-broken horses. That man is an excellent driver who knows how to patiently wield the reins of those wild horses,--the six senses inherent in our nature. When our senses become ungovernable like horses on the high road, we must patiently rein them in; for with patience, we are sure to get the better of them. When a man's mind is overpowered by any one of these senses running wild, he loses his reason, and becomes like a ship tossed by storms upon the high ocean. Men are deceived by illusion in hoping to reap the fruits of those six things, whose effects are studied by persons of spiritual insight, who thereby reap the fruits of their clear perception."