What is the meaning of "the wind knows the grass, and the board swings to know the sincerity of the minister"?

This means that in the violent and crazy wind, you can tell whether it is a strong and tall grass, and in the turbulent times, you can tell whether it is a loyal minister.

Source: To Xiao Yu by Tang Li Shimin: "A high wind knows the strength of grass, while a board swings to know sincerity. Brave people know justice in peace, but wise people are kind. ? "

Only in the violent wind can we see whether it is a strong and tall grass, and only in the violent and turbulent times can we tell whether it is a loyal minister.

How do the brave know the truth of justice for the public, the country and the country? There must be loyalty to the monarch and love for the people in the hearts of those who are both wise and brave.

Extended data

This poem is simple in poetry, vivid in reasoning and profound in meaning, and simply reveals the dialectical relationship between "wisdom", "courage", "benevolence" and "righteousness". This is not only of practical significance for knowing people and being good at their duties, but also enlightening for readers to improve themselves and how to make themselves useful talents with both wisdom and courage.

Now, I quote the phrase "a strong grass with one stroke knows the high wind, and a strong loyal minister with one stroke", that is to say, only after a sharp and complicated struggle test can we examine a person's true quality and moral integrity and see who is a strong loyal minister.