When the dividing of Adam Rishon's soul into individual souls took place , these souls were connected to physical bodies in our world. Man can feel that he has been endowed with a body and a soul. All souls are connected to each other and if it weren't for the selfishness which has been injected in us all souls would feel part of the one and same thing. This is why there is a basic commandement based on universal love which states that man must consider his fellow men like himself There is nothing but the Creator and the universal soul blending perfectly with Him.
Correction means transforming one's own sensations.
Nothing really changes around us. Only veils are removed from our eyes and it becomes clear that we are united with the Creator. In order to reach this state one must work hard and persevere. The amount or quality of our knowledge does not matter , only efforts to reach the goal are important. In our world commandements must be observed both on physical-motionless and spiritual levels.