Knowing their malice, Jesus said, "why are you testing me, you hypocrites? ..."
The Pharisees flattered Jesus telling Him that they knew He was truthful. But their flattery was obvious. Jesus knows their hearts and called them hypocrites!
Aesop has a fable about a sly fox and a bird. The bird had a big yummy cube of cheese in its beak. The fox wanted it. So the fox flattered the bird. "I heard that you had the most beautiful voice in the forest." The bird was a fool and fell for the flattery. He opened his beak to sing and in doing that the cube of cheese fell out and down into the mouth of the fox. This time flattery worked.
Don't be susceptible to flattery. Be suspicious of anyone flattering you.