John Gill Bible Commentary

And Balaam said unto Balak, lo, I am come unto thee,.... And therefore let nothing more be said of what is past: and as for future things: have I now any power at all to say anything? that would be agreeable to the king, and answer his purpose in sending for him, namely, to curse the people of Israel; he suggests that he had not, he was under the powerful restraint of God; he could not say what he himself was inclined to say, and what the king would have him say, and he expected he should; he could not say as some in Psa 12:4, the word that God putteth in my mouth, that shall I speak; whether agreeable to Balak's will and design or not, and whether for or against Israel: however, it being expressed in such indefinite terms might leave room for Balak to hope it might answer his expectations and wishes.