When we think thoughts, we automatically know that the brain in our head is working and when we feel emotions, we feel it in our heart. I marvel at how God has made us thus. Of the two, the heart occupies a more central spot, for it is the heart that communes with God. Giving the heart to God is the ultimate giving of oneself. Our first priority, more than to keep the heart healthy, is to keep it pure and undefiled for the glory of God.