Jnana Yoga
Jnana yoga meditation represents the path of discernment and wisdom and involves withdrawing the emotions and mind from all deluded perceptions and thus living totally attuned with reality.
Jnana Yoga can be called the yoga of study and is ideal for those who are intellectual. It tries to achieve release for its practitioners through the reading of the yogic scriptures.
It has been known as as the most direct, yet at the same time the most challenging, of the branches of yoga
One way to achieve this state is through the neti-neti technique (not this, not this) which discards any disturbing thoughts.