I lived in the kingdom of Morocco. I cannot even imagine just walking up to the king and telling him there’s not going to be any rain unless I say so. He would probably chop my head off. It must’ve taken Herculean spiritual strength for Elijah to speak that way to King Ahab. The message that Elijah received from God to speak to king Ahab about a drought could ONLY have come from God. As corrupt as that kingdom was, if Elija’s message had not been from God, Elijah would have lost his life on the spot.
On the other hand, when the Holy Spirit fills our mouth with his words, we have abilities that we would not have ordinarily had. Look at Peter, the fisherman. He didn’t exactly receive public speaking training. He wasn’t a ToastMaster. But when the Holy Spirit fell on him, he spoke, and he he kept speaking even when it cost him his life.