|When man is born, he is tender and weak. In death he becomes stiff and hard.|
All things, the grass as well as trees, are supple and soft while alive. When dead they become brittle and dried.
So hardness and stiffness very often accompany death, the soft and gentle could be companions of life.
The headstrong army will lose in battle. They say "the weapon that's too hard will be broken, the tree that has the hardest wood will be cut down". Yes, a hard tree will be cut down.
So the hard and mighty eventually should be cast down; and the soft and weak may be set on high.