What Sayyidna Shu'aib (علیہ السلام) had said to his people was good counsel based on earnest fellow feeling. But, his people responded to him with a sarcasm that was biting. However, they had done that to a blessed prophet of Sayyidna Shu'aib's class. He heard their caustic comments, yet turned to them with the same empathy and once again tried to make them see the truth. He said: يَا قَوْمِ أَرَأَيْتُمْ إِن كُنتُ عَلَىٰ بَيِّنَةٍ مِّن رَّبِّي وَرَزَقَنِي مِنْهُ رِزْقًا حَسَنًا (0 my people, tell me, if I am on a clear path from my Lord and He has provided me from Himself with a good provision, [ should I still leave you unguided?] ) Sayyidna Shu'aib (علیہ السلام) was telling his people that he had been blessed by his Lord in that He gave him good provision for his material life and in that He also gave him the light of revelation and spiritual insight. Now, with these wonderful assets in his hands, how could he ever think of becoming like them, willingly embracing error and injustice, and thus failing to bring the truth home to them?
After that, he said: وَمَا أُرِيدُ أَنْ أُخَالِفَكُمْ إِلَىٰ مَا أَنْهَاكُمْ عَنْهُ (and I do not want to do in your absence what I prohibit for you). This tells us that the way a preacher of religion conducts his life has a major role in what he preaches. What a preacher does not himself practice produces no effect on others.
Then, he said: إِنْ أُرِيدُ إِلَّا الْإِصْلَاحَ مَا اسْتَطَعْتُ (I want to do nothing but to set things right as far as I can). And since, this effort too was not by his personal choice and volition, he further said: وَمَا تَوْفِيقِي إِلَّا بِاللَّـهِ ۚ عَلَيْهِ تَوَكَّلْتُ وَإِلَيْهِ أُنِيبُ (And my ability to do things comes from none but Allah. In Him alone I have placed my trust, and to Him alone I turn in humbleness).