Prayer, necessity of, in Bible study, [132], [599], [600].

Luther's belief in, [156], [157], [209], [210].

power of, [210].

lack of, [373], [488].

necessity for, [525], [530], [601].

in time of trouble, [621], [622].

Preaching, of Luther, [152].

of Zwingle, [174-177], [180].

of Farel and Froment, [232].