1024. Outward hardenings pertain to the physical and earthly, or outward, elements of a person. These make up a kind of skull with its hairy scalp. The inward ones have to do with the inward falsities acquired through a person's inward thoughts. These falsities harden into such crusts. Those hardening the skull are earthly falsities, those hardening the medulla, spiritual ones.
1024. Exterior things which pertain to what is corporeal and natural, or the exteriors of man, constitute, as it were, a skull with hair. Interior things have regard to those interiors which man has acquired through interior thoughts. It is falsities which harden these crusts: natural falsities harden the skull, and spiritual falsities harden the medulla.
1024. Quae exteriora sunt pertinent ad corporea, et naturalia, seu exteriora hominis, haec constituunt quasi cranium cum capillitio, interiora spectant ad interiora hominis per ejus interiores cogitationes acquisita, sunt falsa quae indurant tales crustas; quae cranium sunt falsa naturalia, quae medullam sunt falsa spiritualia.