Wisdom or constrained evolution?

A good snake knows it does have legs

A good leopard knows it is fast, but it is fragile

A good bird knows it can fly, but it cannot run

In biology, it is called constrained evolution

In  our society, it is called wisdom

Complement 

There is no pain that comes from
outside

Puzzle and muzzle

“

Before a man can even think about the big puzzle,

he must handle his own

muzzle

 “