Meditation is undivided, unchanged, all-embracing. The heart of meditation is eternity without center or edge, pure lovers braided and blended by other lovers we can never meet. It isn't something we do. It is what we are, underneath the skin, meat, and seeds of the guava-body. All techniques require effort, intention, discipline, will.
Concentration wears a watch and knows when to start and when to stop.
Concentration owns a ruler to measure progress. Meditation has neither watch nor ruler. Meditation never begins and never ends. Meditation is a feast wholly unto itself, with you and I centerpieces on its handcrafted table. In the world of words, meditation and silence are synonymous.