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.
Because of deep love, one is courageous. Because of frugality, one is generous. Because of not daring to be ahead of the world, one becomes the leader of the world.
If you see what is small as it sees itself, and accept what is weak for what strength it has, and use what is dim for the light it gives then all will go well. This is called Acting Naturally.
Why is the sea king of a hundred streams? Because it lies below them... If the sage would guide the people, he must serve with humility. If he would lead them, he must follow behind. In this way when the sage rules, the people will not feel oppressed.