All the forces that we see in nature, such as gravitation, attraction, and repulsion, or as thought, feeling, and nervous motion - all these various forces resolve into that Prana, and the vibration of the Prana ceases. In that state it remains until the beginning of the next cycle. Prana then begins to vibrate, and that vibration acts upon the Akasha, and all these forms are thrown out in regular succession.
Swami VivekanandaFirst, meditation should be of a negative nature. Think away everything. Analyse everything that comes in the mind by the sheer action of the will. Next, assert what we really are-existence, knowledge, and bliss-being, knowing, and loving.
Swami Vivekananda