The heart means love. A good heart means love to the Lord and to the neighbor, while a hard or stony heart means the love of self or the world -- riches and things. When the psalmist asks the Lord to search his heart, he wants the Lord to see what it is that he loves. And we are what we love. What we eat may form our earthly body, but it's only temporary, what we love forms our spiritual body, beautiful or ugly as we have chosen. It's interesting to note that the first multi-cellular motion of our embryo is the pulsating that starts in a twist of blood vessel that is to become our heart, and the last motion of our natural body is our heartbeat. It is there for all of our natural life. And of course there is a beating heart in our spiritual bodies when we come to put them on.

28. The reason “the Son of Humanity” means the Lord as the Word was that the prophets were also called “children of humanity.” The reason they were called this is that they represented the Lord as the Word and therefore meant the teaching of the church drawn from the Word. That is exactly what people in heaven understand by “prophets” when they are mentioned in the Word. The spiritual meaning of “prophet” and also of “son of humanity” is the teaching of the church drawn from the Word, and when it is said of the Lord, it means the Word itself.

For the prophet Daniel being called a son of humanity, see Daniel 8:17.

For the prophet Ezekiel being called a son of humanity, see Ezekiel 2:1, 3, 6, 8; 3:1, 3-4, 10, 17, 25; 4:1, 16; 5:1; 6:2; 7:2; 8:5-6, 8, 12, 15; 11:2, 4, 15; 12:2-3, 9, 18, 27; 13:2, 17; 14:3, 13; 15:2; 16:2; 17:2; 20:3-4, 27, 46; 21:2, 6, 9, 12, 14, 19, 28; 22:18, 24; 23:2, 36; 24:2, 16, 25; 25:2; 26:2; 27:2; 28:2, 12, 21; 29:2, 18; 30:2, 21; 31:2; 32:2, 18; 33:2, 7, 10, 12, 24, 30; 34:2; 35:2; 36:1, 17; 37:3, 9, 11, 16; 38:2, 14; 39:1, 17; 40:4; 43:7, 10, 18; 44:5.

We can see from this that the Lord as the Divine-Human One is called “the Son of God, ” and as the Word is called “the Son of Humanity.”