Punishment of the Disbelievers and Reward of the Pious Believers

Here, Allah mentions the punishment of the disbelievers and the reward of the righteous believers, after describing the Kufr and Shirk that the disbelievers indulge in,

لَّهُمْ عَذَابٌ فِى الْحَيَوةِ الدُّنْيَا

In the verse: أَفَمَنْ هُوَ قَائِمٌ عَلَىٰ كُلِّ نَفْسٍ (Is then He, who is watchful over everyone ... 33), the ignorance and irrationality of the disbelievers has been exposed by saying that these people are certainly short on sense when they equate inert idols with His pure Being, a Being that watches everyone and is the ultimate reckoner of everyone's deeds. Then, it was said that the real reason behind their unreasonable attitude is that shaitan has made their very ignorance look good in their sight and, therefore, this they take to be 'achievement' and 'success.'