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, prayerless. Christians call on God; worldlings ignore God, and call not on his name. Prayer is the expression of a relation to God, a yearning for divine communion. It is the outward and upward flow of the inward life toward its original fountain. It is an assertion of the soul’s paternity, a claiming of the sonship which links man to the eternal.