तां योगमिति मन्यन्ते स्थिरामिन्द्रियधारणाम् ।
अप्रमत्तस्तदा भवति योगो हि प्रभवाप्ययौ ॥ ११ ॥
tāṃ yogamiti manyante sthirāmindriyadhāraṇām |
apramattastadā bhavati yogo hi prabhavāpyayau || 11 ||
This firm holding back of the senses is what is known as Yoga. Then one should become watchful, for Yoga comes and goes.
NOTE: Tranlsation and commentary is missing from the book. The alternate translation for the verse presented above is from Swami Paramananda.