Our hearts contain key ideas about God, ourselves, those around us, and our circumstances. If our core beliefs are skewed, we are well on our way to sinful bitterness of heart and life. We can never change until we give careful attention to what we believe. Proverbs 23:7 reminds us that, “As a man thinks in his heart, so is he.” In the area where we struggle with bitterness, we need to evaluate what wrong beliefs need to be discarded and what correct beliefs need to be developed. As we rebuild our core beliefs, through the principles and precepts of the Word of God, we can find the joy we long for in the midst of the circumstances of life. It is not always easy to change the way we think and react to our circumstances, but it is possible through the power of the Holy Spirit that dwells in the heart of every true follower of Jesus Christ.