Adam Clarke Bible Commentary

And both these kings' hearts shall be to do mischief - That is, Antiochus, and Ptolemy Philometer, who was nephew to the former, and whose interest he now pretended to have much at heart, since the Alexandrians had renounced their allegiance to him, and set his younger brother Euergetes upon the throne. When Antiochus came to Memphis, he and Philometer had frequent conferences at the same table; and at these times they spoke lies to each other, Antiochus professing great friendship to his nephew and concern for his interests, yet in his heart designing to ruin the kingdom by fomenting the discords which already subsisted between the two brothers. On the other hand, Philometer professed much gratitude to his uncle for the interest he took in his affairs, and laid the blame of the war upon his minister Eulaeus; while at the same time he spoke lies, determining as soon as possible to accommodate matters with his brother, and join all their strength against their deceitful uncle. But it shall not prosper - Neither succeeded in his object; for the end of the appointed time was not yet come.