Jamieson, Fausset and Brown on Numbers 22:8-15

8-14. Lodge here this night, and I will bring you word again, as the Lord shall speak unto me, &c.--God usually revealed His will in visions and dreams; and Balaam's birth and residence in Mesopotamia, where the remains of patriarchal religion still lingered, account for his knowledge of the true God. His real character has long been a subject of discussion. Some, judging from his language, have thought him a saint; others, looking to his conduct, have described him as an irreligious charlatan; and a third class consider him a novice in the faith, who had a fear of God, but who had not acquired power over his passions [Hengstenberg].