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.

5579. 'When they had finished eating the corn' means when there deficiency of truths. This is clear from the meaning of 'the corn' as truth, dealt with in 5276, 5280, 5292, 5402 - the fact that there was a deficiency of such truth being meant by 'they had finished eating it'. The situation in the spiritual world is that those there satisfy their hunger with truths and forms of good; for they constitute the food for those there, 5576. But once that food has served its purpose those people enter a further state of dearth. It is like the nourishing of a person with material food, in that once this food has served its purpose that person feels hungry again. This kind of hunger, which is a dearth of spiritual things, is eveningtime for those in the spiritual world, or the darkest part of their day; but this is followed by twilight and morning. Those there pass through alternating phases Like these. They enter that eveningtime or state of spiritual hunger to the end that they may long for and have a desire for truths and forms of good, which are more nutritious when they are hungry for them, even as material food is for someone who is famished. From this one may see what is meant by a dearth of spiritual things when there was a deficiency of truths.