What we see with our eyes can be overwhelmed by our hearts.  What is inside can dominate what is seen on the outside.  For example, a beautiful woman can look in the mirror and see ugly because of what is in her heart and how she feels about herself. 

Ron McGatlin says it this way:  There can be a difference in the abundance of our heart and the intent of our heart.  From the abundance of the heart the mouth speaks.  The intent of our heart might be to bless.  However, if our heart is filled with stored resentment of painful experiences, it may become the abundance of what is in our heart.  Our mouth will speak from the abundance of resentment and bitterness rather than from the intent of our heart to bless. 

Luke 6:45 “A good man out of the good treasure of his heart brings forth good’ and an evil man out of the evil treasure of his heart brings forth evil.  For out of the abundance of the heart his mouth speaks

The intent of the heart is primary and important.  Yet, the practical function of blessing flowing from the heart is more geared to the abundance of the heart.  Forgiveness and healing cleanses the abundance of our heart and sets us free to express the intent of our hearts to bless and build up the kingdom of God in others and in the world around us.

You can read all of Ron’s article here: http://www.openheaven.com/forums/forum_posts.asp?TID=39901&PN=1