﴿ وَتِلْكَ ٱلْأَمْثَٰلُ نَضْرِبُهَا لِلنَّاسِ ۖ وَمَا يَعْقِلُهَآ إِلَّا ٱلْعَٰلِمُونَ ﴾

“And so We propound these parables unto man: but none can grasp their innermost meaning save those who [of Us] are aware”

(As for these similitudes, We coin them) We explain them (for mankind, but none will grasp their meaning) i.e. the meaning of the similitude of the Qur'an (save the wise) those who profess Allah's divine Oneness.