Men will only guard what is valuable. There are not many guards posted at the local city dump, but there are armed guards and security measures at the bank or the expensive jewelry store, because of the great value in these places. This basic human principle says something about God’s view of the heart. He knows that the heart is of great value to Him and to the one who possesses it. And thus the command to watch our heart as one would the wealthiest bank in the world. The integrity and vitality of our spiritual lives depend on it!