What comes out of the mouth proceeds from the heart. Matthew 15:18
Just as a nutritional diet low in saturated fats and exercise is important to the physical health of your heart, so is a regular regiment of prayer, Scripture reading, and reception of the Sacraments important for the spiritual health of your heart. A steady diet high in sodium and saturated fats leads to plaque buildup in the arteries of the heart, leading to heart disease.
The same is true of your spiritual heart. Like plaque, unresolved anger, bitterness, and unforgiveness can severely weaken your spiritual heart, blocking the flow of God’s love, mercy, and forgiveness to your spouse and family. This heart disease is at the root of marital strife and can result in the death of a marriage.
Calling Couples to Christ 