E.M. Bounds says in his book on prayer:
Nothing distinguishes the children of God so clearly and strongly as prayer. It is the one infallible mark and test of being a Christian. Christian people are prayerful. The worldly-minded are prayer less. Christians call on God. The world ignores God and does not call on His name. But even the Christian has to cultivate continual prayer. T must be habitual, but it must be much more than a habit. It is duty, yet is one that rises far above and goes beyond the ordinary implications of the term. It is the expression of a relationship with God, a yearning for divine communion. It is the outward an upward flow of the inner life toward its original fountain. It is a statement of the soul’s origin, a claiming of sonship that links man to the eternal. Prayer has everything to do with molding the soul into the image of God. It also has everything to do with the elevating and enlarging the measure of divine grace. It has everything to do with bringing the sold into complete communion with God. It has everything to do with enriching, broadening, and maturing the soul’s experience of God. A man who does not pray
...