Those parables – We strike them for people (so that they may see the truth and mend their ways). But none reasons to understand (their true meaning and purpose) save the knowledgeable
Thus We emphasize these examples to people! But none can duly evaluate them with their intellect other than those of knowledge!
Sayyed Abbas Sadr-Ameli
And such are the parables We set forth for mankind, but none understand them but the learned (ones)
Al-muntakhab fi tafsir al-Qur'an al-Karim
Such parables do We discourse to people -that they might hopefully ponder-. Such examples and illustrations are only grasped with the minds of those who know the facts and apprehend them with their senses