Or do you feel secure that He who [holds authority] in the (67:17)

Almuntakhab Fi Tafsir Alquran Alkarim

Or do you feel that secure, and in your minds you are sure, that He Who is in His heavens realm will not drive against you a storm, violent, mad, powerful all round and strong, and only then will it come into your heads that Allahs warning is not a jest, but a pledge of what is to come

Tafseer Tafheem-ul-Quran by Syed Abu-al-A'la Maududi

(67:17) Do you feel secure that He Who is in the heaven will not let loose upon you a storm of stones? *26 Then shall you know what My warning is like! *27

Or do you feel secure that He who [holds authority] in the meaning

*26) The object is to impress this: " Your very survival and well-being on the earth are at alI tunes dependent upon Allah Almighty's grace and bounty: you are not strutting about on this earth at will by your own power: you are under obligation only to Allah's protection for each moment of your life that you are passing here, otherwise Allah at any moment may cause such an earthquake to occur as may make this very earth to become your grave instead of the cradle that it is, or may cause a windstorm to blow razing all your towns and settlements to the ground. "
*27) "My warning": the warning that was being given through the Holy Prophet (upon whom be peace) and the Qur'an to the disbelievers of Makkah to the effect: "If you do not refrain from your disbelief and polytheism and do not accept the message of Tauhid being given to you, you will be overtaken by the scourge of God."
 

Or do you feel secure that He who [holds authority] in the meaning in Urdu

کیا تم اِس سے بے خوف ہو کہ وہ جو آسمان میں ہے تم پر پتھراؤ کرنے والی ہوا بھیج دے؟ پھر تمہیں معلوم ہو جائے گا کہ میری تنبیہ کیسی ہوتی ہے