9051. 'Eye for eye' means if anything is injured by them in the inner part of the understanding. This is clear from the meaning of 'the eye' as the understanding, in this instance the inner part of it, the life of which is the life of faith. A person's understanding has an outer part and an inner part The outer part of his understanding is where thought that enters his awareness is, whereas the inner part is where thought that does not enter his awareness is, though it enters that of the angels. This part of the understanding is what the Lord enlightens when a person receives faith, for it exists in the light of heaven and holds within it a person's spiritual life. This is not made plainly evident to the person while in the world, but it is made so to that person in the next life when he becomes an angel among angels in heaven. In the meanwhile that life lies hidden within the thought belonging to the outer part of the understanding, producing there the holiness and reverence for the Lord, for love and faith in Him, for the Word, and for everything else that is the Church's. The reason why 'the eye' means the understanding is that the eye corresponds to the understanding; for the understanding sees in the light of heaven, but the eye sees in the light of the world. The things that the former eye, that is, the understanding, sees are spiritual, and its field of vision is the factual knowledge contained in the person's memory. But the things which the physical eye sees are earthly, and its field of vision consists in every object that appears in the world. Regarding 'the eye', that in the spiritual sense it means the understanding, and also faith since faith composes the life of the inner part of the understanding, see 2701, 4403-4421, 4523-4534.

[2] Anyone who does not know that 'the eye' is used in the Word to mean the understanding cannot know what the meaning is of the things which the Lord spoke concerning the eye in the Gospels, first of all these,

If your right eye causes you to stumble, pluck it out. It is better for you to enter the kingdom of God with one eye, than having two eyes, to be cast into the Gehenna of fire. Matthew 5:29; Mark 9:47.

Everyone recognizes that the eye should not be plucked out even if it does cause a person to stumble, and that no one enters the kingdom of God with only one eye. But 'the right eye' means falsity in a person's belief about the Lord; this is what must be plucked out. Then there are these things spoken by the Lord,

The lamp of the body is the eye. If therefore your eye is sound, your whole body will be full of light. If your eye is evil your whole body will be full of darkness. If therefore the light that is in you is darkness, how great is the darkness! Matthew 6:22-23; Luke 11:34.

Nor is 'the eye' used here to mean the eye, but an understanding composed of the truth of faith. This is why the eye is called 'the lamp of the body' and why the Lord says, 'If the light that is in you is darkness, how great is the darkness!' For 'darkness' in the spiritual sense is falsities constituting faith, 1839, 1860, 4418, 4531, 7688, 7711.

[3] There are these words too spoken by Him,

Why do you notice the speck which is in your brother's eye, but do not consider the plank that is in your own eye? Matthew 7:3-5.

'Noticing a speck in a brother's eye' means seeing something erroneous in a person's understanding of truth; 'the plank in one's own eye' is huge evil of falsity, since 'wood' in the internal sense means good and in the contrary sense evil, 643, 2784, 2812, 3720, 8354. Good is also represented in the next life by a plank, which is why those who pretend to have good within themselves are seen carrying a plank, walking in safety as they do so. If 'eye' and 'plank' did not have these meanings, would 'seeing a plank in an eye' have any meaning at all? If it is not known that 'eye' in the Word means the understanding of truth, which is faith, neither can it be known what is implied by the Lord's action when He healed the blind man,

He spat on the ground and made clay with His saliva, and said to him, Go, wash in the pool of Siloam. John 9:6-7.

Since all the Lord's miracles, like all Divine miracles, had to do with those things that belong to the Lord's kingdom and the Church, 7337, 8364, so did this miracle too.

7780. 'Even to the firstborn of the servant-girl who is behind the mill' means falsified truths of faith that occupy the very last place. This is clear from the meaning of 'the firstborn' as faith, dealt with immediately above in 7779, and since faith is meant, so is truth in its entirety because truth, being that which one ought to believe, is the component of faith; and from the meaning of 'a servant-girl' as a rather external affection for truth, or an affection for knowledge, dealt with in 1895, 2567, 3835, 3849, and 'the servant-girl behind the mill' as the most external affection for knowledge since 'behind the mill' means that which occupies the very last place. The expression 'behind the mill' is used because 'the mill' has reference to matters of faith. For by means of a mill grain is ground into flour and so prepared for making bread, and 'flour' means truth which results in good, 'bread' the actual good that results from it. Thus 'sitting at the mill' is acquiring and learning the kinds of things that will be of service to faith, and through faith of service to charity. This is why when the ancients described learning the basic elements of faith they described it as 'sitting at the mill', or learning elements even more basic as 'sitting behind the mill'. It is because such things were meant that in His teachings about the final period of the Church the Lord says,

Two women grinding at the mill; one will be taken and the other will be left behind. Matthew 24:41.

These words would never have been used if 'the mill' had not meant matters of faith. For what 'the mill' and 'grinding' mean in the internal sense, see 4335. With regard to the truths of faith that occupy the first place and those that occupy the very last, it should be recognized that the truths of faith which emanate directly from the good of charity occupy the first place, for they are the outward form taken by good, whereas the truths which occupy the last place are bare truths. For when truths derive in succession from good, each degree of them departs further away from it, till at length they become bare truths. This is the kind of truths meant by 'servant-girls behind mills'.