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 God.

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.