Good walkers leave no track; good talkers do not make mistakes; good counters don’t use instruments; the one who knows how to close a door don’t use a lock, and no one can open it; the one who knows how to tie an object don’t use ropes, and no one can untie it.
So wise souls are good at saving people; that is why no one is forgotten. They are good at repairing things; that's why nothing is abandoned. It's called hidden talent.
This is why righteous ones are teachers of unkind people. Unkind ones are the mirror of righteous ones.
If one does not respect his teacher, and other does not like his mirror, although they may be clever, they are out of track.
This is an important and subtle virtue.