Homilies on the Epistle to the Hebrews

^5. “For this,” he says, “is the covenant that I will make with the house of Israel after those days, says the Lord; I will put My laws into their mind, and write them in their hearts, and I will be to them a God, and they shall be to Me a people.” Thus He says this concerning the New [covenant] because His words are “not according to the covenant which I covenanted.”

But what other difference is there beside this? Now if any person should say that “the difference is not in this respect, but in respect to its being put into their hearts; He makes no mention of any difference of ordinances, but points out the mode of its being given: for no longer” (he says) “shall the covenant be in writings, but in hearts;” let the Jew in that case show that this was ever carried into effect; but he could not, for it was made a second time in writings after the return from Babylon. But I show that the Apostles received nothing in writing, but received [it] in their hearts through the Holy Ghost. Wherefore also Christ said, “When He comes, He will bring all things to your remembrance, and He shall teach you.”