Sri Chinmoy: In Yoga we pray, we concentrate and we meditate. When we pray, we get an inner feeling, that is to say, with our hearts we feel that we are crying for something. When we concentrate, we focus all our intense attention on something, it may be an object or it may be a person. And when we meditate, we enter into the deeper regions, deeper planes of consciousness.
By prayer, we enter into the Kingdom of God, by concentration we can also enter into the Kingdom of God and also, of course, by meditation. These three ways, prayer, concentration and meditation, are the most effective ways to commune with God.