Yoga has its place rather than its value, and its value is for a certain type of mindset.+

Manduka Upanishad:~ Yoga is in the sphere of duality and is unnecessary to one who knows non-duality.

Yoga has its place rather than its value, and its value is for a certain type of mindset.

Yoga will remove restlessness, and helps to get receptiveness, but never Truth because it ignores the external world. Yoga cannot remove ignorance. It is only a step. It removes obstructions.

Yoga can yield only the duality because everything that one can do or practice becomes a vanishing 'known.' It yields the relative truth, i.e., true from a particular viewpoint, not the ultimate truth.

Yoga implies duality! Yoga means joining two things, something to which the yogi is to be joined. He thinks I want to know God, and I want to attain Union. So he has the ego and cannot attain, whereas the first thing in the path of truth is to question the ‘I’ until its illusory nature is perceived and the seeker no longer says "I want to attain ultimate truth.

One has nothing to get for oneself, as it has vanished on inquiry, not even will he say I will work for the sake the humanity.

In Sutra Bashya and Manduka Upanishad, ~ Samadhi and sleep are identical.

Brihad Upanishad does not advocate Samadhi.

It is not possible to stop the thoughts for more than a second whilst in the waking experience. If one succeeds in controlling thought and then banishes it, one passes into Nirvikalpa Samadhi, which is identical to deep sleep. The only difference between ordinary deep sleep and Samadhi, therefore, is that the ordinary man falls asleep involuntarily, whereas the yogi has the satisfaction of knowing that he has passed into sleep by his own effort of will in banishing thoughts.

Sage Patanjali warns against sleep as a hindrance to yoga; he means when it occurs in the early stages of the practice, before one has obtained the power of control, and consequently, to banish the thought. The fact that Samadhi is deep sleep is kept secret because people would not be tempted to take up yoga. Then what is the value of it? Why, to sharpen the mind, to enable it to keep away all extraneous thoughts when one gets out to reason in the practice of the next higher stage, i.e., Gnana.:~Santthosh Kumaar