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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 does bear a part. These are certain signs to know Faithful friend from flattering foe.

William Shakespeare (1833). “The plays and poems of William Shakspeare”, p.942
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 does bear a part. These are certain signs to know