Justice is getting what we deserve. Mercy is not getting what we deserve. Grace is getting what we do not deserve. In grace we get eternal life, something that, quite obviously, we do not deserve. But because of God's love and kindness manifested in Jesus on the Cross, we receive the great blessing of redemption.
Grace rules out all human merit.
He is not because of who we are. The study of the doctrine of sin. Heaven Heaven is the dwelling place of God and for those who go there a place of everlasting bliss. It is logical that a third heaven cannot exist without a first and second. Scripture does not describe specifically the first and second heaven.