Translation: A person who remains stable (neutral) in happiness or sorrow is known as conqueror of sense organs.
Explanation: "इन्द्रियनिग्रह" is the sixth character of religion. "इन्द्रियनिग्रह" means control over sense organs. One who is the slave of sense organs does not have any control one them. One who has not any control over his sense organs gets entangled in different desires and become sad. The person who does not feel joy or become sad (means remains nuetral or stable) by listening, by touching, by seeing, by eating or by smelling is known as the conqueror of sense organs. In the Gita also, the characteristics of such vicissitudes are mentioned.
Ears, skin, eyes, tougue and nose are the entry points through which words, touch, beauty, taste and smell enter our body. A person gets entangled in different desires and become sad. So, to be happy, a person should conquer these five sense organs which cause his downfull.