The perfect square lacks corners.
If princes and kings were not exalted they might be overthrown.
Appetite for food and sex is nature.
There is no calamity greater than lightly engaging in war.
The softest of stuff in the world, penetrates quickly the hardest, insubstantial, it enters where there is no room.
The reason why rivers and seas are able to be lords over a hundred mountain streams, is that they know how to keep below them. That is why they are able to reign over all the mountain streams.