The Best Friend

Best friend like a pair of shoes
Similiar cretions while but never the same
That goes also never side by side,but the goal remains the same
Complement each other,and will never be replaced
Always equal,there is no higher
If only one is missing then the other one has no meaning

Best friend is not like scissors
Always walk straight,but separate us from the part of us that good

Best friend like a needle and thread
Although stab,but unify