Growing up I felt a certain emphasis on the word "mansions." I kind of came to believe and see this verse as some kind of reward system. Be faithful, follow the commandments, complete your daily churchy checklist (ie say prayers, read scriptures, etc..) and in return you will have earned yourself a mansion in the sky. Not a bad paycheck eh?
After learning about Joseph preparing a place for Mary so that she could come live with him and his family I started thinking that this must be what Jesus really meant. Not some glory prize for a life lived well, but a place for us to come and live with Him and His family. After all, doesn't Jesus constantly refer to Himself as the bridegroom? I was able to find another translation of John 14:2 it reads, "In my Father’s house are many rooms: if it were not so, I would have told you. I go to prepare a place for you. " And then back to King James for John14:3 "And if I go and prepare a place for you, I will come again, and receive you unto myself; that where I am, there ye may be also."
Maybe the difference between mansions and rooms seems trivial to you, and maybe it's just one of those aha moments that is hard to share with others. Either way, this was very moving to me and brought so much of Christ's teachings together in full circle for me. He loves us and wants us to be with Him and His family. He isn't some clerk handing out gift certificates for the afterlife. He is our friend and our brother and He is preparing to welcome us home.
Merry Christmas!