There are two distinct lines of seed promised to Abraham. One, an earthly seed, to be like the dust of the earth, without number (Gen. 13:16), centered wholly in the earth by a relationship of physical generation (Gen 12:7); the other seed were likened to the stars of heaven, without number (Gen. 15:5), centered wholly in the heavenlies by a relationship of spiritual regeneration, which is represented in Christ and the Church (Rom. 4:1-5).