Concentration is the arrow.
Meditation is the bow.
When we concentrate, we focus all our energies upon some subject or object in order to unveil its mysteries. When we meditate, we rise from our limited consciousness into a higher consciousness where the vastness of silence reigns supreme.
Concentration wants to seize the knowledge it aims at. Meditation wants to identify itself with the knowledge it seeks.
Concentration does not allow disturbance, the thief, to enter into its armory. Meditation lets him in. Why? Just to catch the thief red-handed.
Concentration is the commander who orders the dispersed consciousness to come to attention.
Concentration and absolute firmness are not only inseparable but also interdependent divine warriors.
Concentration challenges the enemy to a duel and fights him. Meditation, with its silent smile, diminishes the challenge of the enemy.
Concentration says to God: "Father, I am coming to You." Meditation says to God: "Father, do come to me."
An aspirant has two genuine teachers: concentration and meditation. Concentration is always strict with the student; meditation is strict at times. But both of them are solemnly interested in their student's progress.