ἐπὶ καρδίας. The gift of an inner law, not written on granite slabs, but on the fleshen tablets of the heart, is the first promise of the New Covenant. It involves the difference between the Voice of the Spirit of God in the Conscience and a rigid external law: the difference, that is, between spirituality and legalism. This is brought out in Ezekiel 36:26-29.

ἔσομαι αὐτοῖς εἰς θεόν. The phrase εἶναι, γίγνεσθαι εἰς (fieri, mutari in aliq.) became an established formula in the LXX.

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Old Testament