There is no meditation in concentration, but there is already concentration in meditation. - Swami Rama

Many teachers these days think meditation can be attained without concentration. That ignorant idea is misleading. The mind as it is in its ordinary nature remains in a dissipated state. Without gathering together and concentrating the energy of mind, the deeper state of meditation is not possible. The student who practices sitting in a quiet and calm place even for a short time can experience a bit of unusual joy, though he is not able to experience the deep joy of the meditative state. Why should one be afraid of concentration? Some say that concentration of mind can bring about strain and stress and thus should not be practiced. They even say that discipline is not needed, and they create simplified methods and call them meditation. Such teachings appear to make difficult sadhana easy, but these methods do not lead one to the higher dimensions of life.

Swami Rama
Perennial Psychology of the Bhagavad Gita commentary, Chapter 6