Hatha Yoga Pradipika – Sadhana should be kept secret for success
Hathavidya param gopya yogina siddhimichchata /
bhavedviryavati gupta nirvirya tu praksita // (Chapter -1, Verse – 11).
Hatha yoga practice is the greatest secret of the yogis who wish to achieve perfection (siddhi). Indeed, to be fruitful, it must be kept secret; revealed it becomes powerless. (Chapter -1,Verse – 11).