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Prophet Shu'aib hastened to add these words to show that he could not claim with certainty even this much that they would not return to the creed of the disbelievers. A believer who rightly and fully comprehends the significance of the power of Allah, knows that it is His Will that prevails over everything. Therefore he cannot claim with certainty, "I will do this or I will not do this, for the fulfillment of this or that depends entirely on the will of my Lord. If He will, I shall become successful, otherwise I shall fail in it."
Allah has taught the same thing in XVIII: 23-24:
"Never say about anything, 'I will do this tomorrow, for you cannot do anything, but say, If it be Allah's Will'."