The distinction between hearing and comprehending

وَتِلْكَ ٱلْأَمْثَـٰلُ نَضْرِبُهَا لِلنَّاسِ ۖ وَمَا يَعْقِلُهَآ إِلَّا ٱلْعَـٰلِمُونَ

And these examples We present to the people, but none will understand them except those of knowledge.