The source and inspiration of Christian song is the word of Christ. ‘Let the word of Christ dwell in you richly in all wisdom.’ The common phrases of common life cannot satisfy the soul filled with the Spirit and rich with the wealth of Christ’s indwelling word. Religious emotion finds truer and more fitting expression in poetry than in prose. If God had not given to His Church poets, as well as apostles, evangelists, pastors, and teachers, the best that is in us could never have been uttered. Words and phrases that are large enough for intercourse with our fellows become cramped and inexpressive when we speak to God. Praise and penitence alike would often be silent in the congregation of the saints if they could not at once veil and reveal their profoundest feelings in psalms and hymns. Poetry gives to devotion those robes of glory and beauty without which it would, at times, be almost unseemly to join in the public worship of God or to disclose the heart’s secrets in the presence of fellow-worshippers. Our theme, then, is peculiarly sacred, since it deals with the spiritual songs in which earnest and sincere men have uttered, in the very presence of God, their most secret thoughts, confessions, and aspirations. Every true hymn was first spoken by one man to God alone, was prayed before it was sung, though now it may be heard daily from ten thousand voices. Harsh or flippant criticism is out of place here, an irreverent impertinence, like the interruption of private prayer. In the study of hymns Put off thy shoes from off thy feet; The place where man his God shall meet Be sure is holy ground.[2] Yet St. Paul himself reminds us that the word of Christ is to dwell wisely as well as richly in our hearts. ‘Let the word of Christ dwell in you richly in all wisdom.’ ‘Next to a sound rule of faith, there is nothing of so much consequence as a sober standard of feeling in matters of religion.’[3] Morbid, insincere, fanatical, or exaggerated emotion is as much to be deprecated as doctrinal error, and its evils are at least as disastrous. The diffusion of false or superficial sentiment in the household of the faith is like the spreading of a subtle disease which saps the strength and mars the beauty of devotion, while error bears a charmed life if it comes in the words of a familiar and attractive hymn. Moreover, it is in the hymns of the Church rather than in its formal declarations of faith and doctrine that we find the truest and generally the most favourable revelation of its character. Hymnology is a more important element in the history of religion than most Church historians and theological writers have recognized.[4]