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.

3412. 'All the wells which his father's servants had dug in the days of Abraham his father, the Philistines stopped them up' means that people who possessed knowledge of cognitions did not wish to know interior truths that came from the Divine and so effaced them. This is clear from the meaning of 'wells' as truths, dealt with in 2702, 3096, here interior truths coming from the Divine since the wells, which mean truths, are said to have been dug by 'his father's servants in the days of Abraham his father' - 'Abraham' representing the Lord's Divine itself, 2011, 2833, 2836, 3251, 3305 (end); from the meaning of 'stopping up' as not wishing to know and so effacing; and from the representation of 'the Philistines' as people who possess no more than a knowledge of cognitions, dealt with in 1197, 1198.

[2] The subject at this point is the appearances of truth that belong to the lower degree, which are able to exist with those who possess a knowledge of cognitions and whom 'the Philistines' are used to mean here. With regard to the interior truths that come from the Divine and are effaced by those called the Philistines, the position is that in the Ancient Church and after it the name Philistines was used for those who gave little thought to life and very much to doctrine, and who in course of time even rejected matters of life and acknowledged matters of faith - which faith was separated from life - as being the essential element of the Church. As a consequence they attached no importance at all to matters of doctrine concerning charity which in the Ancient Church constituted the all of doctrine, and so they effaced it. Instead they proclaimed matters of doctrine concerning faith and centred the whole of their religion in these. And since in this way they departed from the life of charity, that is, from charity as the sum and substance of life, they more than all others were called 'the uncircumcised'. For by 'the uncircumcised' were meant all in whom charity was not present, no matter how much doctrine they knew, 2049 (end).

[3] Because such people departed from charity they also removed themselves from wisdom and intelligence, for no one can have a wise and intelligent discernment of what truth is unless good, that is, charity, reigns in him. Indeed all truth originates in good and has regard to good, so that anyone who is devoid of good is unable to have an intelligent discernment of truth, and does not even wish to know it. When such people in the next life are far away from heaven, light bright as snow is sometimes seen to be with them. But that light is like the light in wintertime which, being devoid of warmth, is unproductive. This also explains why, when such persons draw near to heaven, their light is converted into utter darkness, and their minds into something akin to that darkness, which is stupidity. From these considerations it may now be seen what is meant by the statement that people who possessed no more than a knowledge of cognitions did not wish to know interior truths that came from the Divine and so effaced them.