"In the deep meditative absorption of samādhi, body and mind merge into a single conscious unity: the mind’s essential knowing nature, pure and simple, still and silent. This convergence gives rise to a feeling of pure and harmonious being so wondrous as to be indescribable, and so perfectly pleasurable that it may become addictive. But, regardless of how sublime their experience is, these states of meditative absorption are still defiled by the presence of craving, anger and delusion. Samādhi experiences of this kind will be no more than mundane in nature, and the spiritual insights gained from them will result in mundane wisdom still tainted by those defiling influences.
A mind simplified and unified by samādhi becomes very deep, clear and powerful. Only by directing this focus to the practice of contemplation can true transcendent wisdom be attained. A profoundly insightful investigation of the body, feelings and the mind can uproot afflictions of craving, hatred and delusion, thus realizing the ephemeral and empty nature of all phenomena, eliminating craving and achieving freedom from the cycle of repeated birth and death. Concentration and wisdom must work together, propelling meditation towards its goal like the two wheels of a cart. The calm and concentration of samādhi enables wisdom to reach and remove deep-seated defilements through the use of specialized contemplative techniques. By uprooting these perversions, wisdom, in turn, deepens meditative calm. Thus concentration and wisdom work in tandem to guide the meditator along the Buddha’s path to enlightenment."