The vanity of idolatry.
Jonah had been brought into association with idolaters in the person of the mariners of the ship but of which he had been cast. It may be that this fact accounts for the reference in this passage to those who worship other gods than the Lord. The more he experienced the faithfulness and goodness of Jehovah, the more was he convinced that there was none other entitled to reverence, confidence, and prayers.
I. THE DESCRIPTION HERE GIVEN OF IDOLATERS. They are such as "observe lying vanities." The Hebrews, whether pious or not, were monotheists, and regarded with contempt the idolatrous superstitions of their neighbours. The language of irony occurs in several places of Old Testament Scripture when allusion is made to the impotence of the gods of the nations. Yet it may be profitably remembered by ourselves, who may have no immediate connection with professed idolaters, that whatever men substitute for God, as the law of life and the object of devotion and trust, will surely deceive all those who put their faith therein.
II. THE FATE HERE FORETOLD OF IDOLATERS. Their "mercy," their "goodness," is the God whom they forget, and to whom they are so infatuated as to prefer the "lying vanities" here censured. They who quit the Lord prepare for themselves a terrible fate. In God is salvation; out of him is destruction. There is something appalling in the doom which is here described as overtaking those who, when the Saviour may be found, turn their back upon him, in order to seek and to serve other gods. Such are said to "forsake their own mercy." They act against their highest interests; they refuse the richest blessing; they abjure their truest Friend.