when you know that you dont know
dont you know that you dont know
when you know that you cannot know
you know that you cannot know when you know that you know
it is a

thing of the past

when you know that you know that you dont know
it is a thing of the past

Dr. Ramesh Chandra Mukhopadhyaya

http://www.poemhunter.com/poem/thing-of-the-past/