The story of hare and tortoise is not just a tale, it's a truth of life.
A child wins prizes and stands first in the class. The peers appear to appreciate it, but in reality they develop envy and jealousy. On this side this child grows up and performs poorly in relationships with others. The child's very superiority will prevent it from becoming one with others.
So also, hardness and physical power is not going to pay in the long run. It is true softness and vulnerability that will stand the tests of time.
You can break down a hard thing, but you can't break down a very soft material.