For, indeed, the Christian Church on earth has no greater power or work than such common prayer against everything that may oppose it. This the evil spirit knows well, and therefore he does all that he can to prevent such prayer. Gleefully he lets us go on building churches, endowing many monastic houses, making music, reading, singing, observing many masses, and multiplying ceremonies beyond all measure. This does not grieve him, nay, he helps us do it, that we may consider such things the very best, and think that thereby we have done our whole duty. But in that meanwhile this common, effectual and fruitful prayer perishes and its omission is unnoticed because of such display, in this he has what he seeks. For when prayer languishes, no one will take anything from him, and no one will withstand him. But if he noticed that wished to practise this prayer, even if it were under a straw roof or in a pig-sty, he would indeed not endure it, but would fear such a pig-sty far more than all the high, big and beautiful churches, towers and bells in existence, if such prayer be not in them. It is indeed not a question of the places and buildings in which we assemble, but only of this unconquerable prayer, that we pray it and bring it before God as a truly common prayer. [Sidenote: Proof From the Scriptures] XIII. The power of this prayer we see in the fact that in olden times Abraham prayed for the five cities, Sodom, Gomorrah, etc., Genesis xviii [Gen. 18:32], and accomplished so much, that if there had been ten righteous people in them, two in each city, God would not have destroyed them. What then could many men do, if they united in calling upon God earnestly and with sincere confidence? St. James also says: "Dear brethren, pray for one another, that ye may be saved. For the prayer of a righteous man availeth much, a prayer that perseveres and does not cease" [Jas. 5:16 ff.] (that is, which does not cease asking ever more and more, although what it asks is not immediately granted, as some timid men do). And as an example in this matter he sets before us Elijah, the Prophet, "who was a man," he says, "as we are, and prayed, that it might not rain; and it rained not by the space of three years and months. And he prayed again, and it rained, and everything became fruitful." There are many texts and examples in the Scriptures which urge us to pray, only that it be done with earnestness and faith. As David says, "The eyes of the Lord are upon the righteous, and His ears are open unto their cry." [Ps. 33:18] Again, "The Lord is nigh unto all them that call upon Him, to all that call upon Him in truth." [Ps. 145:18] Why does he add, "call upon Him in truth"? Because that is not prayer nor calling upon God when the mouth alone mumbles. [Sidenote: Thoughtless Prayer]