" He that is thy friend indeed,
He will help thee in thy need:
If thou sorrow, he will weep;
If thou wake, he cannot sleep:
Thus of every grief in heart
He with thee doth bear a part.
These are certain signs to know
Faithful friend from flattering foe. "

― William Shakespeare , The Passionate Pilgrim (By Shakspere, Marlowe, Barnfield, Griffin, And Other Writers Unknown)