Jnana means wisdom or discernment. Jnana yoga is the path of wisdom and jnana meditation
is many-faceted.
This is supposed to be the yoga of the intelligent or the superior few. All other
varieties of yoga are believed ultimately to lead to this kind of yoga, in which
one comes to look at everything in the world as it is, without any ignorance
and bias. This is supposed to be achieved through a continued practice of a strenuous
mental discipline and virtue. This variety is also called Raja Yoga, because it
is the highest variety, so to say, or the yoga that presides. Perhaps it is the
variety which patanjali has described in his Yoga Sutra. He has said that
it is made of eight parts, five of which are said to be external, and three internal.
Yama and Niyama, that is, the first two patts, are concerned respectively
with what habits a student of yoga should avoid (e.g. harming others, speaking Jies,
stealing, gathering wealth unnecessarily, etc.), and what habits he should positively
cultivate (e.g. cleanliness of the body and mind, contentment, devotion etc.) Asana
and Pranayama, which are respectively the third and fourth parts in
patanjali's system, are dealt with elaborately in Hatha Yoga. The fifth part, namely,
Pratyahara, indicates a withdrawal of the sense organs from the objects
of enjoyment. The next three parts consist of a process of progressive mental concentration.
Patanjali argues that through a faithful and intense practice of these eight parts
of yoga for a sufficient length of time, a student of yoga can wash away all the
impurities of his body and mind, so that he attains knowledge which ultimately liberates
him from bondage and ignorance. This yoga is also called Ashtanga Yoga, because
of the fact that it is made of eight parts. It is also sometimes called Dhyana Yoga,
because of an emphasis on mental concentration. We find a lucid description of this
variety of yoga in the sixth chapter of the Gita. It is usually this yoga
that is implied whenever the word "yoga" stands alone without any qualification.