Friend-what it means?

who is THIS?

a person -a person who is close to you

a person who knows all about you

a person who knows your weakness

a person who knows your strength

a person who influences your your decision

a person who changes your opinion

not only about the world

but aboutyour own self

and you know -man is a bundle of  vices

he makes error too

THEN IS IT WISE TO  HAVE A FRIEND AND TO DEPEND?