On one hand there is 'What is', and on the other hand there is 'What should be'. What is - is the truth, and What shd be - is the realm of imagination. If we somehow erroneously conclude that what is, is incomplete, and run after What shd be, then this is the longest and also a never ending journey, and is called Samsara. This is the real duality, the prescription to all sufferings. The solution simply lies in becoming aware of the truth of 'What is'. That is freedom - Moksha.