My son, if your heart is wise, then my heart will be glad; my inmost being will rejoice when your lips speak what is right. (Prov. 23:15-16)(NIV)
Developing a heart that is skilled in following God's ways requires exceptional commitment. Because of sin, we enter this world with a spiritual "heart disease". The heart, the inner control center that thinks, feels and makes choices, is clogged with all kinds of evil thoughts, sexual perversions, deceit, pride and foolishness.
Bringing healing to our hearts begins with a passionate fear of the Lord (Prov. 23:17). It requires distancing ourselves from people who will lead us into a life overdosed on pleasure (Prov. 23:21). We must weed out evil thoughts, desires and motives (Prov. 4:23), and fill our minds with true, pure, admirable thoughts (Phil. 4:8). We must listen carefully to the right sources of input (Prov. 23:19,22). Believers who are aware of God's wrath against sin and the brevity of life will give their days to the pursuit of a heart of wisdom (Ps. 90:12).
--from the Quest Study Bible by Zondervan