How can You feel Secure against the Punishment of Allah while He is Able to seize You however He wil

This is another indication of His gentleness and His mercy with His creatures. He is able to punish them because some of them disbelieve in Him and worship others besides Him, yet He is forbearing, He pardons, and He gives respite for an appointed time without hastening. This is as He says,

وَلَوْ يُؤَاخِذُ اللَّهُ النَّاسَ بِمَا كَسَبُواْ مَا تَرَكَ عَلَى ظَهْرِهَا مِن دَآبَّةٍ وَلَـكِن يُؤَخِّرُهُمْ إِلَى أَجَلٍ مُّسَمًّى فَإِذَا جَآءَ أَجَلُهُمْ فَإِنَّ اللَّهَ كَانَ بِعِبَادِهِ بَصِيراً

أَمْ أَمِنتُم مَّن فِي السَّمَاءِ أَن يُرْ‌سِلَ عَلَيْكُمْ حَاصِبًا ۖ فَسَتَعْلَمُونَ كَيْفَ نَذِيرِ‌ (Or, have you become fearless of Him who is in the sky if He looses a violent wind with stones against you? So, you will soon come to know how was My warning! - 67:17). In other words, they at the moment feel secure that the Supreme Being in the heaven will not release against them a sudden squall of stones together with violent wind. Soon they will realise how true the Divine warning was, but by the time they realise its veracity it would be too late. Now that they are safe, sound and secure, it is the time for them to give it a thought.

The next verse refers to the former nations who denied and rejected the truth and how they were annihilated by Divine scourge. Every person needs to draw a lesson from the punishment meted out to them.