The passage in which Amos most explicitly illustrates this harmony between event and conviction is one whose metaphors we have already quoted in proof of the desert's influence upon the prophet's life. When Amos asks, _Can two walk together except they have made an appointment?_ his figure is drawn, as we have seen, from the wilderness in which two men will hardly meet except they have arranged to do so; but the truth, he would illustrate by the figure, is that two sets of phenomena which coincide must have sprung from a common purpose. Their conjunction forbids mere chance. What kind of phenomena he means, he lets us see in his next instance: _Doth a lion roar in the jungle and have no prey? Doth a young lion let forth his voice from his den except he be catching something?_ That is, those ominous sounds never happen without some fell and terrible deed happening along with them. Amos thus plainly hints that the two phenomena on whose coincidence he insists are an utterance on one side, and on the other side a deed fraught with destruction. The reading of the next metaphor about the bird and the snare is uncertain; at most what it means is that you never see signs of distress or a vain struggle to escape without there being, though out of sight, some real cause for them.[155] But from so general a principle he returns in his fourth metaphor to the special coincidence between utterance and deed. _Is the alarum-trumpet blown in a city and do the people not tremble?_ Of course they do; they know such sound is never made without the approach of calamity. But who is the author of every calamity? God Himself: _Shall there be evil in a city and Jehovah not have done it?_ Very well then; we have seen that common life has many instances in which, when an ominous sound is heard, it is because it is closely linked with a fatal deed. These happen together, not by mere chance, but because the one is the expression, the warning or the explanation of the other. And we also know that fatal deeds which happen to any community in Israel are from Jehovah. He is behind them. But they, too, are accompanied by a warning voice from the same source as themselves. This is the voice which the prophet hears in his heart--the moral conviction which he feels as the Word of God. _The Lord Jehovah doeth nothing but He hath revealed His counsel to His servants the prophets._ Mark the grammar: the revelation comes first to the prophet's heart; then he sees and recognises the event, and is confident to give his message about it. So Amos, repeating his metaphor, sums up his argument. _The Lion hath roared, who shall not fear?_--certain that there is more than sound to happen. _The Lord Jehovah hath spoken, who can but prophesy?_--certain that what Jehovah has spoken to him inwardly is likewise no mere sound, but that deeds of judgment are about to happen, as the ominous voice requires they should.[156]