One definition of GRACE is unmerited divine assistance freely given by God to humans for their regeneration or sanctification. I think of it as unconditional love offered to an undeserving soul. If that is somewhat close to truth, then I believe the relationship of grace to bitterness is defined beautifully in one of the first prayers we hear as children. In this the Lord points out how to prepare our hearts to accept Grace: (Matthew 6:12-14 Amplified Bible (AMP))12 “And forgive us our debts, as we also have forgiven ([a]left, remitted, and let go of the debts, and have given up resentment against) our debtors.” God’s Grace is like a cool clean brook, which God has caused to flow in front and around us to be free for our taking, yet bitterness will cause us to self-righteously hold fast to our thirst. By opening ourselves in kindness and mercy toward those that may have hurt us, we position ourselves to receive so much more of the same kindness and mercy from God. So simple, so difficult?