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According to Zamakhshari, Razi and several other commentators, the clause interpolated here between brackets is elliptically implied in Shu'ayb's answer. His stress on the fact that God has graced him amply with worldly goods is meant to remind his countrymen that it is not self-interest that causes him to ask them to be fair in their dealings with their fellow-men.
I.e., "I do not aim at depriving you of what is rightfully yours" - a reference to verse {85} above.
Shu'aib's answer is gentle and persuasive, First, he would ask them not to fly into a passion but satisfy themselves that he had a mission from Allah, and was working in the discharge of his mission: he was not merely finding fault with them. Secondly, though he was a poor man, he asked them to note that he was happy and comfortable: Allah had given him good sustenance, material and spiritual, as from Himself, though he did not resort to the sort of tricks which they considered necessary for their prosperity. Thirdly, if he forbade them anything he wished to apply the same standards to himself. Fourthly, all the advice which he is giving them is for their own good, which he desires to advance to the utmost of his powers. Fifthly, he is humble for himself; he would not set himself up to be their teacher or guide, or expect to be obeyed; the success of any of his efforts on their behalf must come from Allah's grace; will they not therefore turn to Allah, so that Allah's grace can heal them?