I come to a second warning. One must constantly remember not to believe a syllable that Iago utters on any subject, including himself, until one has tested his statement by comparing it with known facts and with other statements of his own or of other people, and by considering whether he had in the particular circumstances any reason for telling a lie or for telling the truth. The implicit confidence which his acquaintances placed in his integrity has descended to most of his critics; and this, reinforcing the comical habit of quoting as Shakespeare's own statement everything said by his characters, has been a fruitful source of misinterpretation. I will take as an instance the very first assertions made by Iago. In the opening scene he tells his dupe Roderigo that three great men of Venice went to Othello and begged him to make Iago his lieutenant; that Othello, out of pride and obstinacy, refused; that in refusing he talked a deal of military rigmarole, and ended by declaring (falsely, we are to understand) that he had already filled up the vacancy; that Cassio, whom he chose, had absolutely no practical knowledge of war, nothing but bookish theoric, mere prattle, arithmetic, whereas Iago himself had often fought by Othello's side, and by 'old gradation' too ought to have been preferred. Most or all of this is repeated by some critics as though it were information given by Shakespeare, and the conclusion is quite naturally drawn that Iago had some reason to feel aggrieved. But if we ask ourselves how much of all this is true we shall answer, I believe, as follows. It is absolutely certain that Othello appointed Cassio his lieutenant, and _nothing_ else is absolutely certain. But there is no reason to doubt the statement that Iago had seen service with him, nor is there anything inherently improbable in the statement that he was solicited by three great personages on Iago's behalf. On the other hand, the suggestions that he refused out of pride and obstinacy, and that he lied in saying he had already chosen his officer, have no verisimilitude; and if there is any fact at all (as there probably is) behind Iago's account of the conversation, it doubtless is the fact that Iago himself was ignorant of military science, while Cassio was an expert, and that Othello explained this to the great personages. That Cassio, again, was an interloper and a mere closet-student without experience of war is incredible, considering first that Othello chose him for lieutenant, and secondly that the senate appointed him to succeed Othello in command at Cyprus; and we have direct evidence that part of Iago's statement is a lie, for Desdemona happens to mention that Cassio was a man who 'all his time had founded his good fortunes' on Othello's love and had 'shared dangers' with him (III. iv. 93). There remains only the implied assertion that, if promotion had gone by old gradation, Iago, as the senior, would have been preferred.