A large kingdom must keep a low profile like rivers and seas where all the waters of the empire converge, that’s to say take the role of the female (a quiet force) in the world. By keeping stillness, the female may always dominate the male. This stillness means keeping a low profile.
Therefore, if a large kingdom comes down before smaller kingdoms, it will win their confidence. If a small kingdom comes down before large kingdoms, it will win their sympathy.
This is why some lower themselves to receive, some lower themselves to be received.
A large kingdom should not have overwhelming desires to interfere in the affairs of small kingdoms. A small kingdom should not have an overwhelming desire for help. So they both get what they wanted.
Large kingdoms should take a modest attitude!