I always proceed from the fact that yoga, in its most essential form, is the prerogative of very few individuals. We can slowly go to it, this also includes our constant seeks and researches, but not everyone in this life reaches the point. Vyāsa, commenting on Patāñjali, gives such a definition of yoga योगः समाधिः  yogaḥ samādhiḥ – “Yoga is samādhi”. We also find a great deal in the texts of the Nāthas and the most essential elements from yoga in diverse Tantras. But, we know that tantric practices have traditionally been largely kept in secret. So, what should be the attitude to yogic sādhanā, if it is the essence of tantric sādhanā? If you look at ancient yoga texts, secrecy is often mentioned there. The question is, what part of the yogic tradition and practice should be open and for whom, and which is closed? This is a very slippery moment, each guru, in one case or another, himself defines this boundary. With whom, when and what boundaries should be, and with whom should they not be at all, depends on each specific situation.