Circumcise your heart, and take away the foreskins of your heart, lest Mine anger go forth because of the evil of your doings (Jer. 4:4). Circumcise therefore the foreskin of your heart, and be no more stiffnecked (Deut. 10:16). To "circumcise the heart" or "the foreskin of the heart," is to purify one's self from evils. On the contrary therefore, one who is "uncircumcised" or "foreskinned" means one not purified from the evils of love merely natural, thus one who is not in charity. And as one who is unclean in heart is meant by "one uncircumcised" it is said:

No [son of a stranger] uncircumcised in heart, and uncircumcised in flesh, shall enter into My sanctuary (Ezek. 44:9). No uncircumcised person shall eat the passover (Exod. 12:48). And that such a one is condemned (Ezek. 28:10; 31:18; 32:19).