Bitterness is harbored hurt hidden in the heart. Of all the emotions I will cover, I believe this one may be the most dangerous. I fear bitterness in my life more than anything else. Do you know why? Because bitterness is an acid that destroys its own container. In a New Testament book called Hebrews 12, there is some strong warning about the danger of bitterness, but also some great wisdom on how to deal with bitterness. If you are bitter now, you will be better later.