379. It is generally recognized that there is a vital warmth in humans and in all animals, but people do not know where it comes from. People discuss it on the basis of conjecture, so if they do not know anything about the way matter is responsive to spirit, they identify the warmth of the sun as its source, some focusing on the activity of particles and some on life itself. However, since these last do not know what life is, they are just substituting one word for another.

However, once people realize that there is a relationship of responsiveness between love and its feelings on the one hand and the heart and its derivative vessels on the other, they can know that love is the source of our vital warmth. Love radiates as warmth from the spiritual sun where the Lord is and is felt as warmth by angels. This spiritual warmth, which essentially is love, is what flows into the heart and its blood by correspondence and instills both its warmth and its life. We know that we are warmed and virtually kindled by our love, depending on its intensity, and that we become sluggish and cold as that intensity decreases. We feel and see this, feeling it in a warmth throughout our bodies and seeing it as our faces flush. In contrast, we feel its loss as a physical chill and see it as faces turn pale.

Since love is our life, the heart is the beginning and ending of our life; and since love is our life and the soul brings its life through the body in the blood, the blood is called the soul in the Word (see Genesis 9:4 and Leviticus 17:14). I will be explaining later [383] what "soul" means in its various senses.

383. Since our discernment corresponds to our lungs, and our thinking therefore to their breathing, "soul" and "spirit" in the Word mean discernment, as in "you shall love the Lord your God with your whole heart and your whole soul" (Matthew 22:35 [22:37]), or "God will give a new heart and a new spirit" (Ezekiel 36:26; Psalms 51:12-13 [51:10]). I have already explained [378-381] that the heart means the love of our volition, so soul and spirit mean the wisdom of our discernment.

You may see in Teachings for the New Jerusalem on the Lord 50-51 that the spirit of God, also called the Holy Spirit, means divine wisdom and therefore divine truth, the means of our enlightenment.

This is why "the Lord breathed on the disciples and said, 'Receive the Holy Spirit'" (John 20:22). This is also why it says, "Jehovah God breathed the breath of life into Adam's nostrils, and he became a living soul" (Genesis 2:7), and why God said to the prophet, "Prophesy over the spirit and say to the wind, 'Come, spirit, from the four winds and breathe upon these who have been slain, so that they may live'" (Ezekiel 37:9). There are similar statements elsewhere as well. It is why the Lord is called the spirit of the nostrils and also the breath of life.

Since our breathing comes through our nostrils, they are used to mean perception. An intelligent person is referred to as "keen-scented," and a dense person as "dull-scented." This is also why in Hebrew and in some other languages, "spirit" and "wind" are expressed by the same word. In fact, the word "spirit" is derived from [a root that means] breathing; so when people die we speak of their "breathing their last." This is also why people believe that a spirit is a wind or something airy, like the breath that issues from our lungs, and believe the same of the soul as well.

We can tell from this that "loving God with the whole heart and with the whole soul" means with all our love and all our discernment, and that "giving a new heart and a new spirit" means a new volition and a new discernment.

It is because the spirit means discernment that it says of Bezaleel that "he was filled with the spirit of wisdom, intelligence, and knowledge" (Exodus 31:3) and of Joshua that "he was filled with the spirit of wisdom" (Deuteronomy 34:9), and that Nebuchadnezzar said of Daniel that "a superlative spirit, one of knowledge and intelligence and wisdom was in him" (Daniel 6:5 [5:11-12, 14]), and why it says in Isaiah that "those who are wandering in spirit will know intelligence" (Isaiah 29:24). Similar statements may be found in many other places.