Lukewarm

Matthew, Mark, Luke and John were walking down the street of Jerusalem. Three of them said they were cool, but Mark said, "Luke warm. As Luke was the coolest disciples,this was a term of endearment bestowed upon him by Mark. He wasn't hot due to his coolness. He was neither too hot nor too cold, but prefect

John : We're fairly cool
Matthew : We're not as cool as Luke though
Mark : You could say we're Lukewarm