5199. 'Beautiful in appearance' means which are expressions of faith. This is clear from the meaning of 'beauty' and 'appearance'. Spiritual 'beauty' is essentially an affection for interior truth, while spiritual 'appearance' is essentially faith, so that 'beautiful in appearance' means an affection for the truth of faith, see 553, 3080, 3821, 4985. The reason spiritual beauty is an affection for interior truth is that truth is the outward form taken by good. The good which they receive in heaven from the Divine provides angels with the life they possess; but the outward form taken by that life is provided by the truths springing from that good. The truth of faith however does not provide the beauty but the affection itself present within the truths of faith springing from good. Beauty that is provided solely by the truth of faith is like the beauty of a face seen in a painting or a sculpture, but the beauty provided by an affection for truth springing from good is like the beauty of a real face full of life imparted to it by heavenly love; for as is the love - that is, as is the affection - which shines out of the form provided by the face, so is the beauty seen there. This being so, the outward appearance of the angels is indescribably beautiful. Their faces are radiant with the good of love passing through the truth of faith, which good and truth not only present themselves visually but can also be felt from the spheres that emanate from them.

[2] The reason why this is the source of beauty is that heaven in its entirety is the Grand Man and has a correspondence with every single part of the human being. Everyone therefore who has the good of love and for that reason the truth of faith present in him has the form which heaven possesses present within him; and as a consequence of this there is also imparted to him the beauty which heaven possesses, heaven being a place where the Divine going forth from the Lord is the All in all. This also explains why those in hell, being the opposite of what is good and true, are horribly ugly, and in the light of heaven do not look like human beings but like monsters. The reason why spiritual appearance (aspectus) is faith is that in the internal sense 'looking at (aspicere) and seeing' means understanding, and in a sense more internal than this having faith is meant, see 897, 2150, 2315, 2807, 3863, 3869, 4403-4421.

553. In heaven those who are moved by mutual love are constantly approaching the spring-time of their youth. And the more thousands of years they live the more joyful and happy the spring-time which they are approaching. This process continues for ever, constantly bringing increases in joy and happiness in proportion to the advance and upward progress in mutual love, charity, and faith. Those of the feminine sex who have died worn out with age but who had lived in faith in the Lord, in charity towards the neighbour, and in happy conjugial love with their husbands, as the years pass by come more and more into the first freshness of youth and early womanhood, and into a beauty that excels every idea of beauty which the eye can possibly behold. In fact it is goodness and charity forming and producing a likeness of itself, and causing the joy and beauty of charity to shine out of every individual feature of the face in such a way that these too are forms of charity. When some people have seen these they have been dumbfounded.

[2] The form which charity takes is so plainly visible in the next life that charity itself is that which produces the form, as well as being that which is portrayed within it. Indeed that form is such that the whole of an angel, especially the face, is so to speak charity - charity which is visible to the eye and perceptible to the mind. When it is beheld that form is one of indescribable beauty which stirs with charity the inmost life itself of the beholder's mind. Through the beauty of that form truths of faith are displayed in a visual image from which they also are perceived. People who have lived in faith in the Lord, that is, faith that inheres in charity, in the next life become such forms, that is, forms of beauty. All angels are such forms, endlessly varying; and it is these forms that constitute heaven.