The enlarging of the border of the good land in the prayer of Jabez signifies the enlarging of the border of the gaining of Christ and the enjoyment of Christ (cf. Phil. 3:8-14), who is the reality of the good land (see note Deut. 8:71). We all should have such a prayer, a prayer that God would enlarge the border of our enjoyment of Christ (cf. Eph. 3:14-19). See note 1 Chron. 4:401.
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