Meditation (Dhyana in Sanskrit) is a specific term in
yoga philosophy. It is different from the term meditation used by most
people. The latter really means keeping the brain peaceful.
Yoga meditation is the penultimate stage in a
progression of stages towards the final state of yoga, namely Samadhi or
yogic trance. Unless given to you by God, achievement of the different
stages of yoga is progressively more difficult and an ability to
meditate needs many decades of quiet dedicated yoga practice, spread
over several lifetimes.
For Dhyana to happen, Kundalini needs to have risen
along the spine and reached the Sahasrara chakra at the crown of the
head. Then you sit and practice keeping the four lobes of the brain
peaceful. In other words, Dhyana is similar to ordinary meditation, but
not just the thinking faculty is at rest, and it is only to be attempted
after Kundalini has risen.
Kundalini rises for a person who is established in
ethics (yama), who practices the triple components of yoga (tapas,
svadhyaya and Ishvara Pranidhana) and where sexual activity has been
such that bursts of energy from orgasm have been released into the
brain. There are two approaches to having Kundalini rise: the
traditional yoga path starting with asanas and progressing to pranayama,
pratyahara and dharana. The other approach is not just to practice the
eight-fold path but also to perform Ishvara Pranidhana, surrender to
Man is part of nature and nature's driving energy is
Kundalini. Yoga practice and sex in combination change Kundalini from
being a potential energy from which all other energies in the body draw
their power, to being an active energy to be utilized in your quest for
vision of and contact with God in the form of divine energy in the
Sahasrara chakra. It is in Dhyana that one begins to realize that direct
vision of and contact with God is possible.