After having established in the first verse that Allah is All-Independent (Ghaniyy), Master of Mercy (Dhur-Rahmah) and All-Powerful too, the text carries a warning given to disobedient people: إِنَّ مَا تُوعَدُونَ لَآتٍ ۖ وَمَا أَنتُم بِمُعْجِزِينَ ﴿134﴾: Surely what you are promised [ that is, the Divine punishment ] is bound to come, and you cannot frustrate [ it ].'
Another method to awaken them from their heedlessness was adopted in the third verse (135) where it was said: قُلْ يَا قَوْمِ اعْمَلُوا عَلَىٰ مَكَانَتِكُمْ إِنِّي عَامِلٌ ۖ فَسَوْفَ تَعْلَمُونَ مَن تَكُونُ لَهُ عَاقِبَةُ الدَّارِ ۗ إِنَّهُ لَا يُفْلِحُ الظَّالِمُونَ ﴿135﴾ (Say, "0 my people, do at your place (whatever you do) I am to do (in my way). So, you will know for whom is the ultimate abode. Surely, the unjust shall not be successful). This is addressed to the Holy Prophet ﷺ . He is being asked to tell those people of his in Makkah that the choice of not accepting what he is saying is theirs. Let them not accept it, stay as they are and keep on doing what their belief and hostility tell them to do - and he too will keep on doing what his belief tells him to do. In that, there was no loss for him. But, very soon, they will be the ones to find out who will be blessed with the ultimate salvation and success of the Hereafter. And, in this, let them not forget that the Zalim, the unjust, the usurpers of rights, never succeed.
Tazkirul Quran
Maulana Wahiduddin KhanOn ayahs 131–134
On Doomsday, when the veil is torn from reality, it will be clear that those who had gone astray, or had misguided others, did not do so because of any misunderstanding. The reason for this was not their being unaware of the truth but their deliberately ignoring it. They could not rise above worldly pomp and show; they could not forego timely benefits. The guidance provided by God through His special subjects was so clear that nobody could have remained unaware of realities, but their worship of the world drew a veil over their eyes; in spite of knowing, they became unaware; in spite of listening, they did not hear. In the Hereafter, they will be shorn of the artificial supports on the strength of which they had remained careless of the Truth. Then it will be pointed out how the Truth had appeared before them and how they had rejected it with the help of false words; how, though their mistake had been explained to them, they still thought that they had been successful in justifying their stand by clever misrepresentations.
Uthmani text of the Madinah mushaf (King Fahd Complex). Translation: Saheeh International. Tafsir via Quran.com.