When Confucius talked about the virtue of water, it was natural to think of a slogan —————————

1. When Confucius talks about the ambition of water, you will naturally think of an idiom-dripping water wears away the stone.

2. Confucius said that water must flow downwards, and you will naturally think of a proverb-man struggles upwards and water flows downwards.

Knowing is knowing, and not knowing is not knowing.