In the 61st chapter of Isaiah, there is a beautiful prophecy of the Lord's advent, and of the impact that it would have. It begins this way:

“The Spirit of the Lord God is upon Me, Because the Lord has anointed Me To preach good tidings to the poor; He has sent Me to heal the brokenhearted.... (Isaiah 61:1)

In the New Testament, in Luke 4:14-22, we see confirmation of this prophecy, in this story:

"14 And Jesus returned in the power of the Spirit into Galilee: and there went out a fame of him through all the region round about.

15 And he taught in their synagogues, being glorified of all.

16 And he came to Nazareth, where he had been brought up: and, as his custom was, he went into the synagogue on the sabbath day, and stood up for to read.

17 And there was delivered unto him the book of the prophet Esaias. And when he had opened the book, he found the place where it was written,

18 The Spirit of the Lord is upon me, because he hath anointed me to preach the gospel to the poor; he hath sent me to heal the brokenhearted, to preach deliverance to the captives, and recovering of sight to the blind, to set at liberty them that are bruised,

19 To preach the acceptable year of the Lord.

20 And he closed the book, and he gave it again to the minister, and sat down. And the eyes of all them that were in the synagogue were fastened on him.

21 And he began to say unto them, This day is this scripture fulfilled in your ears.

22 And all bare him witness, and wondered at the gracious words which proceeded out of his mouth. And they said, Is not this Joseph's son?"

In this passage, who are the poor, and the brokenhearted? They are people who do not yet know enough real truth, or who therefore are not yet able to receive real good. They are people who "are ignorant of truth and who desire it." (Inner Meaning of the Prophets and Psalms 61).

Here's another source:

"These things (above) are said of the Lord. 'The poor' to whom Jehovah has anointed Him to preach good tidings, refers to those who are in few truths, and yet desire truths that their soul may be sustained by them. The 'broken in heart' stand for those who as a consequence are in grief." (Apocalypse Explained 811[17]).

Every person has two spiritual faculties that work together -- a will (the things we love), and an understanding (the things we know and believe in). We're born with both, and they gradually develop. Our original will is mostly selfish, and it needs to be gradually expunged, and replaced by a new unselfish will that the Lord wants to implant and develop in us. On our personal spiritual journeys, that's the the big thing that needs to happen.

Our understanding, at some points in that process, needs to step out ahead of the will, and learn true ideas, and construct them into a framework. There has to be a part of the will that directs the understanding to make this effort, and wants to use the framework. There's another part of the will that says -- no, not interested, don't bother, maybe later. But it's the unselfish part - the good part - that feels this driving need for truth. It's people who are in this state that are poor (needing to learn truth), and brokenhearted (in grief, and therefore wanting to learn truth, so that they can be good, and receive the Lord's love). See Arcana Coelestia 6854[3] and its related cross-references for an interesting discussion of this process.

2284. 'Perhaps ten will be found there' means if remnants were still present. This is clear from the meaning of the number 'ten' as remnants, dealt with in Volume One, in 576, 1738. What remnants are however has been stated and shown in various places already, as in 468, 530, 560, 561, 660, 661, 1050, 1738, 1906, namely that they are all the good and all the truth with a person which lie stored away in his two memories and in his life.

[2] It is well known that there is nothing good nor anything true except that from the Lord; also that what is good and true is flowing in constantly from the Lord into man, but it is received in varying ways, and that in fact it is received according to the life of evil and according to the false assumptions in which the person has confirmed himself. These are what either annihilate, or stifle, or pervert the goods and truths flowing in constantly from the Lord. To prevent goods being mixed with evils therefore, and truths with falsities - for if they were mixed a person would perish for ever - the Lord separates them, and stores away within his interior man the goods and truths he receives. From there the Lord will never allow them to come forth as long as that person is governed by evil and falsity, except at those times when the person has entered some state that is a holy state, or when deeply and anxiously concerned about something, or in times of sickness, or other similar circumstances. These things which the Lord has so stored away in the person are what are called remnants, and of which very much mention is made in the Word, though nobody as yet knows that this is what they mean.

[3] It is according to the nature and the amount of the remnants, that is, of the good and truth residing with him, that a person experiences blessedness and happiness in the next life, for, as has been stated, such remnants are stored away in his interior man and are laid bare when he leaves things of a bodily and worldly nature behind him. The Lord alone knows the nature and the amount of remnants a person has. The person himself cannot possibly know this, for at the present day man is such that he is able to counterfeit what is good while within there is nothing but evil. A person can also appear to be evil and yet may have good within. For these reasons one is never allowed to judge the nature of another person's spiritual life; for the Lord alone, as has been stated, knows this. But one is allowed to judge the nature of another person's life, private and public, since this is of importance to society.

[4] It is very common for those who have adopted an opinion regarding any truth of faith to sit in judgement on others and to say that they cannot be saved unless their beliefs coincide with their own - a judgement which the Lord has forbidden, in Matthew 7:1-2. Yet from much experience I have been led to know that members of every religion are saved provided that they have received through a life of charity remnants of good and appearances of truth. This is what was meant by 'if ten were found [there] they would not be destroyed for the sake of the ten', that is, that if remnants were present they would be saved.

[5] The life of charity consists in thinking what is good in regard to another, and in willing for him that which is good, and in feeling joy within oneself that others as well are saved. But those people do not possess the life of charity whose will is that no others should be saved than those whose beliefs coincide with theirs, especially those who are indignant that the situation is otherwise. This becomes clear solely from the fact that more gentiles are saved than Christians. For people who have thought what is good in regard to their neighbour and have willed for him that which is good accept the truths of faith in the next life more readily than those who called themselves Christians; and they acknowledge the Lord more than Christians do. Indeed nothing gives angels greater delight and happiness than to be teaching those who pass from the world into the next life.