तां योगमिति मन्यन्ते स्थिरामिन्द्रियधारणाम् । अप्रमत्तस्तदा भवति योगो हि प्रभवाप्ययौ ॥ ११॥

This, the firm Control of the senses, is what is called yoga. One must then be vigilant; for yoga can be both beneficial and injurious.