The Pulpit Commentary - Ecclesiastes 9:13
This wisdom have I seen also under the sun ; better, as the Septuagint, This also I saw to be wisdom under the sun . The experience which follows he recognized as an instance of worldly wisdom. To what special event he alludes is quite unknown. Probably the circumstance was familiar to his contemporaries. It is not to be considered as an allegory, though of course it is capable of spiritual application. The event in Bible history most like it is the preservation of Abel-Beth-maachah by... read more
Adam Clarke's Commentary on the Bible - Ecclesiastes 9:18
Wisdom is better than weapons of war - So proved in the case of Archimedes. But one sinner - Such as the Roman butcher above mentioned. Destroyeth much good - Such as were the life and skill of the Syracusan mathematician. One sinner has often injured the work of God; one stumbling-block has sometimes destroyed a revival of religion. Sin acts like a ferment; whatever comes in contact with it, it assimilates to itself. read more