Now therefore hold him not guiltless: for you are a wise man, and know what you ought to do unto him; but his gray head bring you down to the grave with blood.
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Ephrem The Syrian
After expounding the crimes of Joab and Shimei, David entrusts Solomon with their punishment, but only gives him few details about the manner and quality of the punishment: “You will do,” he says, “according to your wisdom.” It is as if he said, Since both Joab and Shimei committed such [terrible] actions, it is unlawful that they are left unpunished. Therefore, solve this matter with the help of your wisdom so that your equity may catch them in their iniquity: may your severity, with the revelation of new crimes, find out the sins that your father’s indulgence had hidden. - "On the First Book of Kings 2.8–9" ...
Man. Many have thought that Solomon was only 12 years old. (Eusebius)
But the best chronologers suppose that he was about 20. God had blessed him with a happy disposition, which he adorned with various graces, chap. iii. 12., and Wisdom viii. 19.