The correspondence of heaven’s two kingdoms with the heart and lungs is the general correspondence of heaven with the human being. The less general correspondence, though, is with the specific members, organs, and viscera, and we need to note what this is like as well.
People who are in the head in the universal human that is heaven are supremely involved in everything good. In fact, they are in love, peace, innocence, wisdom, intelligence, and therefore in delight and happiness. These flow into the head and into the components of the head in us, and correspond to them.
People who are in the chest of the universal human that is heaven are involved in the qualities of thoughtfulness and faith, and also flow into our chests and correspond to them. However, people who are in the groin of the universal human or heaven and in the organs dedicated to reproduction are in marriage love.
People who are in the feet are in the outmost heaven, which is called “natural-spiritual good.” People who are in the arms and hands are in the power of what is true because of what is good. People who are in the eyes are in understanding; people who are in the ears are in attentiveness and obedience; people who are in the nostrils are in perception; people in the mouth and tongue in conversing from discernment and perception.
People who are in the kidneys are in truth that probes and discriminates and purifies; people in the liver, pancreas, and spleen are in various aspects of purification of what is good and true; and so on. They flow into the like parts of the human being and correspond to them.
The inflow of heaven is into the functions and uses of these members, and since the uses originate in the spiritual world, they take form by means of elements characteristic of the natural world and thus make themselves known in their effects. This is the origin of correspondence.
This is why these same members, organs, and viscera in the Word mean similar things. Everything there actually has meaning according to its correspondence. The head there means intelligence and wisdom, the chest thoughtfulness, the groin marriage love, the arms and hands the power of truth, the feet what is natural, the eyes discernment, the nostrils perception, the ears obedience, the kidneys the probing of truth, and so on.
This is also why people commonly say that someone has a good head when they are talking about someone intelligent and wise, why they talk about a truly thoughtful person as a bosom friend, a particularly perceptive individual as having a keen nose, a discriminating one as sharp-sighted,85 someone in power as having a long arm, someone who acts intentionally from love as acting from the heart—these and many other expressions in human language come from correspondence. The expressions actually originate in the spiritual world, though people are unaware of it.
from Heaven and Hell, Sections 96, 97