اَلْجَامِعَةِ 10:10

إِنْ كَلَّ ٱلْحَدِيدُ وَلَمْ يُسَنِّنْ هُوَ حَدَّهُ، فَلْيَزِدِ ٱلْقُوَّةَ. أَمَّا ٱلْحِكْمَةُ فَنَافِعَةٌ لِلْإِنْجَاحِ.

If the iron be blunt, and he do not whet the edge, then must he put to more strength: but wisdom is profitable to direct.