Thus if it be truly stated that it is day, any consequence of that statement, _e.g._ that it is light, must be true also. But a false statement may lead either way. For instance, if it be falsely stated that it is night then the consequence that it is dark is false also. But if we say, "The earth flies," which was regarded as not only false but impossible [Footnote: Here we may recall the warning of Arago to call nothing impossible outside the range of pure mathematics] this involves the true consequence that the earth is. Though the simple syllogism is not alluded to in the sketch which Diogenes Laertius gives of the Stoic logic, it is of frequent occurrence in the accounts left us of their arguments. Take for instance the syllogism wherewith Zeno advocated the cause of temperance-- One does not commit a secret to a man who is drunk. One does commit a secret to a good man. A good man will not get drunk. The chain argument which we wrongly call the Sorites was also a favorite resource with the Stoics. If a single syllogism did not suffice to argue men into virtue surely a condensed series must be effectual. And so they demonstrated the sufficiency of wisdom for happiness as follows---- The wise man is temperate The temperate is constant The constant is unperturbed The unperturbed is free from sorrow Whoso is free from sorrow is happy The wise man is happy The delight which the early Stoics took in this pure play of the intellect led them to pounce with avidity upon the abundant stock of fallacies current among the Greeks of their time. These seem--most of them--to have been invented by the Megarians and especially by Eubulides of Miletus a disciple of Eucleides but they became associated with the Stoics both by friends and foes who either praise their subtlety or deride their solemnity in dealing with them. Chrysippus himself was not above propounding such sophisms as the following-- Whoever divulges the mysteries to the uninitiated commits impiety The hierophant divulged the mysteries to the uninitiated The hierophant commits impiety Anything that you say passes through your mouth You say a wagon A wagon passes through your mouth