The heaven and earth symbolize desires within a person. We are talking about such types of restriction when you will be unable to do anything with these desires: neither with bronze nor with iron.
The heaven has to be the property of Bina, the property of bestowal and love, but it is not. If you do not connect with others like you in the correct interaction, then all of life becomes very tough.
You do not have the Creator or egoistic desire. You exist between them like in the air.
From KabTV’s “Secrets of the Eternal Book” 12/5/16