You could argue that bitterness motivated the Pharisees to have Jesus put to death. You only have to look at India and Pakistan, Israel and Jordan, Bosnia and Croatia, and Northern Ireland to know that wars are caused by bitterness, and that such bitter disputes fuel even more reservoirs of bitterness that last through generations, and continue to hold people in vice-like grips. Personal Consequences There are often physical consequences such as headaches, ulcers, sleeplessness, heart-attacks, anxiety, fear, tension, depression. This, of course, doesn't mean that anyone with a headache or heart-attack is bitter, but prolonged bitterness will have physical consequences. The mental consequences of bitterness are continued hypercritical attitudes.
Nobody can do anything right.
And because of the attitudes that accompany bitterness, there are inevitably social consequences. Bitterness spreads and infects others. They either catch the critical and grouching spirit from the bitter people, or they decide to avoid their company. And, of course, the rejection caused by the bitterness leads to the people concerned feeling even more bitter, and so the cycle continues. Bitter people are not popular in Cell Groups.