So often when we deal with difficult people, it's easy to form judgments about them based on their behavior or attitudes. But have you ever stopped to wonder what has made that person so disagreeable or foolish? When the Bible says God "repays the iniquity of fathers into the bosom of their children" (v. 18), it is speaking about generational cycles of sin. Unless someone in the family line makes a deliberate choice to change, sinful and dysfunctional behavior will be passed from parent to child for many generations.
This is really just a confirmation of the principle of sowing and reaping. We pass down standards for conduct and character traits that we received from our parents. If we are unwilling to change our sinful habits and attitudes, they will very likely find their way into our children's lives.
What is true for sin is also true for wounding. When a child is emotionally bruised in the home, his behavior and character may be negatively affected. With this in mind, think about a difficult person that you know. What hurts do you think shaped his or her life? A heart of compassion originates from a willingness to empathize with those who have been wounded. This doesn't excuse someone's sin, but it does aid in opening our hearts toward the individual.
What about you? Have childhood wounds contributed to who you are today? How have they affected your life? If you haven't dealt with them, you'll probably pass similar hurts down to your children. But with God's help, you can break this cycle and begin a new one that will benefit future generations.