हठ-विद्या परं गोप्या योगिना सिद्धिमिच्छता ।
भवेद्वीर्यवती गुप्ता निर्वीर्या तु प्रकाशिता ॥ ११॥
Hathavidyā param gopyā yoginā siddhimichchatā bhavedvīryavatī guptā nirvīryā tu prakāśitā
A Yogî desirous of success should keep the knowledge of Hatha Yoga secret; for it becomes potent by concealing, and impotent by exposing.
