Yoga as Liberation from Duality...

This material world is a world of duality - at one moment we are subjected to the heat of the summer season and at the next moment the cold of winter. Or at one moment we're happy and at the next moment distressed. At one moment honored, at the next dishonored. In the material world of duality, it is impossible to understand one thing without understanding its opposite...

It is not possible to understand what honor is unless I understand dishonor. Similarly, I cannot understand what misery is if I have never tasted happiness. Nor can I understand what happiness is unless I have tasted misery. One has to transcend such dualities...

...but as long as this body is here these dualities will be here also.

Insofar as one strives to get out of bodily conceptions - not out of the body but out of bodily conceptions - one has to learn to tolerate such dualities.

In the Second Chapter of Bhagavad-gita Krishna informs Arjuna that the duality of distress and happiness is due to the body alone. It's like a skin disease, or skin itch. Just because there is itching, one should not be mad after it to scratch it. We should not go mad or give up our duty just because mosquitoes bite us. There are so many dualities one has to tolerate, but if the mind is fixed in Krishna consciousness, all these dualities will seem insignificant.

How is it one can tolerate such dualities?

"A person is said to be established in self-realization and is called a yogi (or mystic) when he is fully satisfied by virtue of acquired knowledge and realization. Such a person is situated in transcendence and is self-controlled. He sees everything - whether it be pebbles, stones or gold - as the same." (Bg. 6.8)

Jnana means theoretical knowledge, and vijnana refers to practical knowledge. For instance, a science student has to study theoretical scientific conceptions as well as applied science.

Theoretical knowledge alone will not help. One has to be able to also apply this knowledge.

Similarly, in yoga one should have not only theoretical knowledge but practical knowledge. Simply understanding "I am not this body" and at the same time acting in a nonsensical way will not help. There are so many societies where the members seriously discuss Vedanta philosophy while smoking and drinking and enjoying a sensual life. It will not help if one only has knowledge theoretically. This knowledge must be demonstrated.

One who truly understands "I am not this body" will actually reduce his bodily necessities to a minimum. When one increases the demands of the body while thinking "I am not this body," then of what use is that knowledge? A person can only be satisfied when there is jnana and vijnana side by aide.