'Scarlet,' as in Genesis 38:28, signifies spiritual good.

In Isaiah 1:18, this signifies truth derived from good, or truth from a celestial origin, such as is the truth of the Word in its literal and natural sense

'Scarlet,' in Revelation 17:3, signifies truth from a heavenly origin, such as is the truth of the Word in the sense of the letter or natural sense, which is meant by what is holy in it. 

(Референце: Apocalypse Explained 67)

3635. In the human body there are two organs which are the mainsprings of its entire movement, and also of every action and external or purely physical sensation - the heart and the lungs. These two so correspond to the Grand Man or Lord's heaven that celestial angels there constitute one kingdom, and spiritual angels the other, for the Lord's kingdom is celestial and spiritual. The celestial kingdom consists of those who are governed by love to the Lord, the spiritual kingdom of those who are governed by charity towards the neighbour, 2088, 2669, 2715, 2718, 3235, 3246. The heart and its kingdom in man corresponds to celestial angels, the lungs and their kingdom to spiritual ones. Also the angels flow into things belonging to the heart and lungs, so much so that these things receive their being and are kept in being by means of that influx from them. But the correspondence of heart and lungs with the Grand Man will in the Lord's Divine mercy be presented as a separate subject.