There’s a famous sport about the Noda Biyehuda that when he first became Rav and had many opponents they kept trying to test him and trip him up. Once, by a Seudas Bris, they made something look like a questionable piece of may and brought it up to him and asked what it’s Din is. He started leaning towards one ruling and they all brought proofs to the contrary. He hard them out and started to agree to them. Then they brought proofs the other way around and he started leaning towards that. That is when he suddenly announced that this case is made up.
They knew he was right but they wondered how he knew. Jew said, when a Shaila comes to a rav he gets Siatta Dishmaya to answer correctly. If I can’t make up my mind then it must not really be a Shaila.