Good question sir. Here is an advaita view on this. According to this view, the jiva and Paramatma are one.
Jnana means wisdom. Wisdom of what? Wisdom of your own True Nature is Jnana.
You are not this body, nor are you the mind, nor the intellect, nor the individual ego. You are the Brahman, God.
Adi Shankaracharya's Nirvana Shatakam
Mano-Buddhy-Ahangkaara Cittaani Naaham
Na Ca Shrotra-Jihve Na Ca Ghraanna-Netre
Na Ca Vyoma Bhuumir-Na Tejo Na Vaayuh
Cid-Aananda-Ruupah Shivo[a-A]ham Shivo[a-A]ham ||1||
Neither am I the Mind nor Intelligence or Ego,
Neither am I the organs of Hearing (Ears), nor that of Tasting (Tongue), Smelling (Nose) or Seeing (Eyes),
Neither am I the Sky, nor the Earth, Neither the Fire nor the Air,
I am the Ever Pure Blissful Consciousness; I am Shiva, I am Shiva,
Knowing this is Jnana.
Jnana is not different from self-realization or Moksha.
Thus in order to obtain Jnana, one follows Jnana Yoga.
What is Jnana Yoga?
Jnana Yoga is the path by which one tries to experience Himself as He is, without any impurities or falsehood.
Self-enquiry is the way to practice Jnana Yoga.
Daily question ourself Who am I really? Am I this body? Am I this mind? Am I something else?
Who is meditating right now? Who is the one that thinks? What exists in between two thoughts? What is that Reality that is there even in sleep, waking and dreaming state of consciousness?
Sri Ramana Maharishi on self-enquiry, the sword called 'Who Am I?'
The thought ‘who am I?’ will destroy all other thoughts, and like the stick used for stirring the funeral pyre, it will itself be burnt up in the end. Then, there will be Self-realization. When other thoughts arise, one should not pursue them but should diligently inquire: ‘To whom do they occur?’ It does not matter how many thoughts arise. As each thought arises, one should inquire with alertness, “To whom has this thought arisen?” The answer that would emerge would be “to me”. Thereupon if one inquires “Who am I?” the mind will go back to its source; and the thought that arose will subside.
This is Jnana Yoga.
Jnana is not book knowledge or reading books
Jnana is knowledge through experience and not bookish knowledge. Thus one cannot become a Jnani by simply reading all scriptures, one actually has to put these principles into practice and thereby realize the Truth.
Sri Swami Sivananda on Jnana Yoga
The Jnana-Yogin realises that Brahman is the Life of his life, the Soul of his soul. He feels and knows that God is his own Self. He realises that he is one with the Eternal through spiritual insight or intuition, Aparoksha Anubhuti or divine perception, but not through mere study of books or dogmas or theories. Religion is realisation for him now. It is not mere talk. He plunges himself in the deep recesses of his heart through constant and intense meditation—Nididhyasana—and gets the wonderful pearl of Atman, a wonderful treasure much more valuable than all the wealth of the world.
Jnana is not mere intellectual knowledge. It is not hearing or acknowledging. It is not mere intellectual assent. It is direct realisation of oneness or unity with the Supreme Being. It is Para Vidya. Intellectual conviction alone will not lead you to Brahma-Jnana (Knowledge of the Absolute).
Examples of Jnanis
- Swami Vivekananda
- Sri Ramana Maharishi
- Sri Adi Shankaracharya
All the best.