(_b_) The special province of history is, first, to ascertain what the actual words used were; and secondly, to learn why it was that a particular policy or argument failed or succeeded. For a bare statement of an occurrence is interesting indeed, but not instructive: but when this is supplemented by a statement of cause, the study of history becomes fruitful. For it is by applying analogies to our own circumstances that we get the means and basis for calculating the future; and for learning from the past when to act with caution, and when with greater boldness, in the present. The historian therefore who omits the words actually used, as well as all statement of the determining circumstances, and gives us instead conjectures and mere fancy compositions, destroys the special use of history. In this respect Timaeus is an eminent offender, for we all know that his books are full of such writing. (_c_) But perhaps some one may raise the question as to how it comes about that, being the sort of writer that I am showing him to be, he has obtained acceptance and credit among certain people. The reason is that his work abounds with hostile criticism and invective against others: and he has been judged not by the positive merits of his own composition and his independent narrative, but by his skill in refuting his fellow historians; to which department he appears to me to have brought great diligence and an extraordinary natural aptitude. The case of the physicist Strato is almost precisely similar. As long as this man is endeavouring to descredit and refute the opinions of others, he is admirable: directly he brings forward anything of his own, or expounds any of his own doctrines, he at once seems to men of science to lose his faculties and become stupid and unintelligent. And for my part, I look upon this difference in writers as strictly analogous to the facts of everyday life. In this too it is easy to criticise our neighbours, but to be faultless ourselves is hard. One might almost say that those who are most ready at finding fault with others are most prone to errors in their own life.