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.

The Lord is life itself, and we are recipients of life. This is true even of the most evil spirits, who loved only themselves in life and hate and deny the Lord from their place in the lowest hells; the Lord forces life upon them, despite their rejection, in the amount necessary to keep them from ceasing to exist. The situation is much different, of course, with people who accept and follow the Lord; by doing this they open themselves up to the inflow of life, and become more full the more open they are. This is the “life” in question when the Bible uses that word. It indicates spiritual life, the life that comes from the Lord into our hearts and minds. We accept life from the Lord by learning about Him, learning what is right and wrong, and by determining that we will stop doing what's wrong and instead do what is right.