Arcana Coelestia#2029
2029. 'For an eternal possession' means for ever. This is clear without explanation. They are called possessors and also heirs not by virtue of merit but of mercy.
Genesis第17章:8
8
I will give to you, and to your seed after you, the land where you are traveling, all the land of Canaan, for an everlasting possession. I will be their God."