Numbers 22:38

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 ( Psalms 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.