Fire and water are angry and silent. . . . . . .

Water and fire are made up of gas, but there is no life. Plants have life but no wisdom. Animals are wise, but they don't talk about benevolence and morality. Man is made of Qi, which is full of life and wisdom. Therefore, they are the most distinguished between heaven and earth.

Know: to preach "wisdom" is wisdom.

Meaning: here generally refers to benevolence, righteousness and virtue.