[2] The altars were expiated in this way because holy things were polluted by the sins of the people. The people represented the Church; therefore those places which were the Church's, called its sanctuaries, such as the altar and the tent, together with their contents, were defiled whenever those people were guilty of sin; for those sanctuaries were places belonging to the Church. This is also made clear in Moses,

You shall separate the children of Israel from their uncleanness, in order that they may not die in their uncleanness when they pollute My dwelling-place which is in their midst. Lev 15:31.

And in another place,

Aaron shall expiate the holy place from the uncleanness of the children of Israel. Thus shall he expiate the holy sanctuary, and the tent of meeting, and the altar. Lev 16:16,33.

[3] The implications of all this are that those things which are called the holy things of the Church are not holy unless they are received with holy respect; for unless they are received with that respect what is Divine does not flow into them. Anything holy that exists with people is holy only by virtue of what is Divine flowing into it; sacred shrines for example, the altars there, and the bread and wine for the Holy Supper are made holy solely by the presence of the Lord. Therefore if the Lord is unable to be present there on account of the people's sins, those things have no holiness because they lack what is Divine. Furthermore the holy things of the Church are rendered unholy by sins because sins take what is Divine away from them.

[4] This then is the reason why sanctuaries are said to have been polluted by the uncleanness of the people and why those places therefore had to be expiated annually. The reason why the expiations were made with blood on the horns of the altars and not on the altars themselves was that the horns were the extremities of them, and nothing of a person has been purified unless the extremities or what is outermost has been purified. For inner things flow into those that are outermost, but the state of the outermost conditions the inflow. Consequently if what is outermost has been perverted the things within become perverted; for when those inner things flow into outermost ones, the recipient forms into which they descend are conditioned by the state in which the outermost things exist. The situation is like that when the eye is in bad condition; the power of sight which comes from within sees things only as that eye-condition will allow. Or it is like that when the arms are in bad shape; the powers which come from within exert themselves only as that condition will allow. Consequently if the natural man has been perverted the spiritual lacks the opportunity to function properly within the natural man, and this is why the spiritual or internal man is closed.

[5] But see what has been shown already on these matters, namely the following;

If a person is to be purified the natural or external man must be purified, see the places referred to in 9325(end). This is because the path that all influx takes is from the internal to the external, and not vice versa, 5119, 6322. For it is on the natural level within a person that influx from the spiritual world reaches its destination, 5651. The outward aspects of a person have been formed to serve the inward, 5947, 9216, 9828. Thus the external man must be altogether subject to the internal, 5786, 6275, 6284, 6299. This is because the internal man is in heaven and the external man is in the world, 3167, 10156. And the external man by himself or left to himself alone acts contrary to the internal, 3913, 3928.

In addition to all this, see 9701-9709 stating what the internal man is and what the external man is.