The Lord weighs the heart.
A person may think their own ways are right, but the Lord weighs the heart. To do what is right and just is more acceptable to the Lord than sacrifice. Haughty eyes and a proud heart— the unplowed field of the wicked—produce sin. -Proverbs 21:2-4 MSG
It is said of King David that he was a man after God's own heart. What do you think that means? I think that the prophet Micah had a glimpse of such a heart when he said that the Lord desires a heart that embraces justice, mercy and humility - in a sense the first two cannot be walked out apart from the last. Perhaps the heart that God desires most is a broken, contrite and humble one that seeks to live justly and mercifully? The Christian's goal is to have such a heart.
In contrast to this humble heart, Solomon writes of a heart that is likened to unplowed ground - hard and unproductive. Such a heart is proud and is revealed in the haughty ways that it's eyes look upon life. Such a heart does not seek to do justice or mercy for others but only wants what benefits it's selfish desires. The proud heart is the opposite of one after God's own heart because it does not seek out what He wants. Such a heart will not hear God's voice.
Help us Lord to keep ourselves from the things that harden our hearts. Help us to have soft and humble hearts.