It is all about the heart!

As we started a new series on Sunday mornings entitled "The Lord is able to give thee much more than this." we talked about the heart of Amaziah. The bible said that his heart was not perfect in the Lord. I wonder of the Lord could say that about many people today who confess to know Him but don't really want to live for Him.
Through a series of test results my oldest daughter Moriah came home with a heart monitor. It is supposed to read her heart levels through out the day. She has been experiencing some difficulties and we believe it is asthma related but the doctor wants to rule any problems with the heart. So I got to drill her one more time in some basketball drills and more running.
I wonder if we were all attached to a heart monitor and could see the results like the Lord sees our hearts would it change our view on how we are living for the Lord? Imagine at the end of the day knowing where we stood spiritually before the Lord. I know the Lord already knows our heart but that is not the problem. The problem is do we know our hearts?
As any preacher would just like I did Sunday I would ch allege us to guard our hearts because it doesn't take much for a luke warm heart to grow cool and then cold against God. How is your heart?

Preacher