What does Numbers 23:18 mean?

Balaam began his message: Stand up, Balak, and listen. God isn’t a human who changes his mind or lies. If he says something, he’ll do it. If he promises, he’ll make it happen. Numbers 23:18 - Modern Text Bible

(Balaam makes it clear: God’s word is solid. He doesn’t flip-flop or break promises like people do.)