Interpretations of verses of Surat al-Hajj, 16, 19, 21

In this way We have sent it [the Qur’an] down as Clear Signs. Allah says they are clear. “You will understand them very clearly.” Allah guides anyone He wills. (Surat al-Hajj, 16)

You cannot lead into pride anyone who is guided to the truth by Allah, alhamdulillah. It is impossible for anyone you make proud to attain salvation, no matter what they do.

Here are two rival groups who disputed concerning their Lord. Those who are disbelievers will have garments of fire cut out for them, the clothes they wear will appear like fire to them in hell. They will assume the form of fire. Clothes are given them, but clothes of fire. But not the fire we are familiar with. ...and boiling water poured over their heads, (Surat al-Hajj, 19) Not the boiling water we are familiar with. That is the water of hell, something very different. Allah says it will go down to their very cells.

...and they will be beaten with cudgels made of iron. (Surat al-Hajj, 21) Not the iron we are familiar with, the iron of hell, the cudgels of hell. All the laws of physics are very different there, the laws of chemistry are different, the nature of matter itself is different. So it does not mean iron in the sense we are familiar with.