Rav Zeira counted five kinds of "orlah" (things uncircumcised) in the world: (1) uncircumcised ears (as in ), (2) uncircumcised lips (as in ), (3) uncircumcised hearts (as in and ), (4) uncircumcised flesh (as in ), and (5) uncircumcised trees (as in ). Rav Zeira taught that all the nations are uncircumcised in each of the first four ways, and all the house of Israel are uncircumcised in heart, in that their hearts do not allow them to do God's will. And Rav Zeira taught that in the future, God will take away from Israel the uncircumcision of their hearts, and they will not harden their stubborn hearts anymore before their Creator, as says, "And I will take away the stony heart out of your flesh, and I will give you an heart of flesh," and says, "And you shall be circumcised in the flesh of your foreskin."