Question

speech on truth is never debatable

Answer 1

"Truth isn't debatable because it is a fact. For instance, that the earth revolves around the sun is a fact that is unchangeable so it is a true fact. So it is not debatable. But if someone says that humans cannot live without the sun's light then that becomes a personal opinion and hence could be debated. But when we say truth, it becomes a fact and so its existence cannot be debated or questioned.