Allaah (The Most High) said:

وَتِلۡكَ ٱلۡأَمۡثَـٰلُ نَضۡرِبُهَا لِلنَّاسِ‌ۖ وَمَا يَعۡقِلُهَآ إِلَّا ٱلۡعَـٰلِمُونَ

”And these similitudes We put forward for mankind, but none will understand them except those who have knowledge (of Allah and His Signs, etc.)” [29:43]

Imaam Ibnul Qayyim (rahimahullaah) said: ”When some of the Salaf used to come across a similitude (in the Qur’aan) and could not understand it, they would weep and say: ”I am not from those who have knowledge.”

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[Miftaah Daarus Sa’aadah 1/51]