Reason is easy to understand, it is common sense and common sense, it is easy to tell whether it is reasonable or not, and it is not easy to follow blindly. The truth is different, either the mystery of the natural world or the law of history. These are things that ordinary people do not understand. In front of the truth, the common people are in an absolutely low position, and only rely on the knowledge instilled in them by the elites above. They do not know whether it is reasonable or not.
The reason why truth is harder to understand than reason is intended to be explained by the above text.