Never succumb to the temptation of bitterness.Martin Luther King, Jr.
Being able to taste bitterness is important. Bitter herbs can heal.
Living in bitterness creates misery. I have known (up close and personal) people who reside there. Not only are they miserable, but there is danger of contagion if one stays too close for too long.
Yes, it is tempting to go there sometimes. And sometimes, pure grace sweetens the path.