Bhagavad Gita 13.3क्षेत्रज्ञं चापि मां विद्धि सर्वक्षेत्रेषु भारत।क्षेत्रक्षेत्रज्ञयोर्ज्ञानं यत्तज्ज्ञानं मतं मम ॥

The fields are different but the knower of the field is one. The individual souls (Jivatmas) are different but the Supreme Soul (Paramatma) is one. Wherever there is mind, there are lifreath, egoism and the individual consciousness or reflected intelligence side by side. He who has the sense of duality will take birth again and again. This delusion of dulaity can only be removed by knowledge of the identity of the individual soul and the Absolute. I am happy, I am miserable, I am the doer of this action, and I am the enjoyer of this experience -- these are the experiences of all human beings. Therefore the individual soul is bound to Samsara and is subject to pleasure and pain, and the individual souls are in different bodies. But, the Supreme Soul is free from pleasure and pain. It is not bound to Samsara. It is eternally free. It is one without a second.If there is only one individual soul in all bodies, all should have the same experience at the same time. If Rama suffers from abdominal colic, Krishna also should experience the pain at the same time. If John experiences joy, Jacob also should have a similar experience. If Choudhury is stung by a scorpion, Banerjee also should suffer from the pain. But this is not the case. When Rama suffers, Krishna rejoices. When John is jubilan, Jacob is depressed