indriyāṇi parāṇyāhur indriyebhyaḥ paraṁ manaḥ
manasas tu parā buddhir yo buddheḥ paratas tu saḥ || 42||

My Understanding : We must control our senses, as the conscience is more powerful than them. Through food, our body is sustained, and in turn, the senses function. Behavior, however, is even more powerful than the conscience. It is through intelligence that we are able to distinguish between good and bad deeds.