In truth, we have but one soul, as Kabbalah teaches, we are all rooted in Adam’s soul – however, just like a body, when it’s together, the brain feels the pain of the hand but if the parts were separated one would not feel the pain of the other, hence, though we are in different bodies, the source – the Rebbe in each generation (whose soul is the source soul of the people in his generation) can actually feel the pain of each and every soul.