5320. 'And placed a chain of gold onto his neck' means an outward sign denoting the joining of interior things to exterior ones, good being that which effects that joining together. This is clear from the meaning of 'the neck' as a flowing in, also the communication of higher things with lower ones, or what amounts to the same, interior things with exterior ones, dealt with in 3542; and therefore 'a chain', because it goes around the neck, is a sign denoting the joining together of those things. 'A chain of gold' means a joining together by means of good; that is, good is the means which effects it, because 'gold' means good, 113, 1551, 1552. A sign denoting the joining of interior truth to exterior truth is meant by 'a chain onto the neck' in Ezekiel,

I adorned you with ornaments and put bracelets onto your hands and a chain onto your neck. Ezekiel 16:11.

The internal meaning of “blood” is a little tricky. In most cases, blood is linked with Divine Truth and it’s relationship with the Lord. But in some cases, especially when discussing the first half of Genesis, the Works of Swedenborg link blood to a state of caring, or love to the neighbor. No absolute explanation is offered for this, but it’s worth noting that blood takes a number of forms in the body – it sometimes carries nutrients and oxygen, sometimes waste products, and sometimes nutrients and carbon dioxide. So it’s not unreasonable for blood to have different meanings in different contexts.