Q. Krishna says in Bhagavad Gita that one who attains His spiritual abode there is no chance of returning.  If we all were originally with Him then how did we come here? Is there any chance of going there permanently?
A. Although originally all living entities were in the eternal spiritual world,they have a tendency to fall down because they are minute in nature and have free will. Lord Krishna does not interfere with anyone’s free will.If He does, then it is not free will. We should call it as forced will. By exercising our free will to be separate from the Lord ,we have fallen in this temporary material world.However being the eternal well-wisher of all living entities, Supreme Lord accompanies all living entities by expanding Himself as Supersoul in the hearts of all.
And in this way He constantly guides and calls everyone back to His eternal abode. He does not like to see His children suffering. Whenever someone has a minute desire to understand Him, He sends either His bonafide representative or His instructions as in the form of Bhagavad-gita to give us proper direction. If someone follows the words of Bhagavad-gita or His bonafide representative, he/she shall be able to achieve the perfection of life.Lord Krishna promises in Bhagavad-gita that when living entity once goes back home, back to Godhead, there is no question of falling down again.