"Behold, you have not understood; you have supposed that I would give it [i. e., the power to translate] unto you, when you took no thought, save it was to ask me; but, behold, I say unto you, that you must study it out in your mind; then you must ask me if it be right, and if it is right I will cause that your bosom shall burn within you; therefore, you shall feel that it is right; but if it be not right, you shall have no such feelings, but you shall have a stupor of thought, that shall cause you to forget the thing which is wrong." This is the Lord's description of how Oliver Cowdery _could_ have translated with the aid of Urim and Thummim (see context of the revelation quoted), and it is undoubtedly the manner in which Joseph Smith _did_ translate the Book of Mormon through the medium of Urim and Thummim. This description of the translation destroys the theory that Urim and Thummim did everything, and the seer nothing; that the work of translating was merely a mechanical process of looking at a supplied interpretation, in English, and reading it off to an amanuensis. This description in the D&C implies great mental effort; of working out the translation in the mind, and securing the witness of the Spirit that the translation is correct. In all this, Urim and Thummim are helpful. They are an aid doubtless to concentration of mind. They may have held at the time just the characters to be translated at the moment, and excluded all others; the translation thought out in the seer's mind may also have been reflected in the interpreters and held there until recorded by the amanuensis, all of which would be incalculably helpful. But since the translation is thought out in the mind of the seer, it must be thought out in such thought-signs as are at his command, expressed in such speech-forms as he is master of; for, man thinks, and can only think coherently, in language; and, necessarily, in such language as he knows. If his knowledge of the language in which he thinks and speaks is imperfect, his diction and grammar will be defective. That errors of grammar and faults in diction do exist in the Book of Mormon (and more especially and abundantly in the first edition) must be conceded; and what is more, while some of the errors may be referred to inefficient proof-reading, such as is to be expected in a country printing establishment, yet such is the nature of the errors in question, and so interwoven are they throughout the diction of the book, that they may not be disposed of by saying they result from inefficient proofreading, or referring them to the mischievous disposition of the "typos," or the unfriendliness of the publishing house. The errors are constitutional in their character; they are of the web and woof of the style, and not such errors as may be classed as typographical. Indeed the first edition of the Book of Mormon is singularly free from typographical errors.