Stones in the Bible in general represent truths, or things we know concerning the Lord and what He wants from us and for us in life. This is why the people of Israel built altars of stone, and is also why stoning was a principal form of capital punishment (using truth to destroy falsity, or in the negative sense using falsity to destroy truth). It is also why precious stones are described in such detail on Aaron's breastplate and ephod, and also in the New Jerusalem in Revelation; precious stones represent true ideas directly from the Lord with the various colors showing various forms of love. Stones are not alone in representing truth, of course -- it sometimes seems that almost everything in the Bible represents either true ideas or desires for good. But that makes sense, since our thoughts and our desires together are everything we are in life, and the interplay between them is what life is all about. The many ways they are represented in the Bible reflect the incredible variety in our feelings and thoughts, though we can only distantly understand how those representations work. In the case of stones, in their weight, strength and permanence they tend to represent true ideas that come from a desire for good, the understanding we can have if we are truly good and loving -- and in the highest sense the exalted ideas that come from the Lord's love. Those ideas are ones that are not easily moved or changed, and make wonderful foundations for the things we want to build in our spiritual lives.

8067. 'And as a memorial between your eyes' means that it shall be constantly in their understanding. This is clear from the meaning of 'memorial' too as constant recollection, the word 'memorial' being used because it has reference in the Word to the understanding, whereas 'sign' has reference to the will; and from the meaning of 'the eyes' as the understanding, dealt with in 2701, 3820, 4403-4421, 4523-4534. This is why 'as a memorial between the eyes' means that it shall be constantly in their understanding, that is, their thinking.

Something brief will be said to show how one should understand the explanation that it shall be constantly in the understanding and constantly in the will. The things which have imprinted themselves on a person through faith and charity, that is, which he fully believes and loves, are constantly in his thought and will. He thinks them and wills them even when he contemplates and deals with other matters, and imagines that those things are not present in his mind at that time. For they are indeed there among other things which determine the character of his mind. The truth of this is plainly evident from the spiritual sphere surrounding a spirit or angel; for when the spirit or angel approaches, that sphere tells one immediately about his faith and about his charity, and about much more that he has at heart, even though he is not thinking about them at the time. Such are the things that constitute the life of every mind and remain constantly there. These considerations could be illustrated by very many details to be observed in a person, such as his reflections on different things, his affections, the ways to act that have been ingrained in him since early childhood, and the like, which are continually present and hold sway although he does not consciously think about them at all. It is similar with love to the neighbour, love to God, and a love of goodness and truth, and with faith. People with those kinds of love and with faith will and think them constantly; for such love and faith reside within these people, and when they do so they are said to be reigning throughout, see 6159, 6571, 7648.