There was once a boy with two parents. His mother had always been loving, sensitive, and caring toward the boy while his father -- an alcoholic -- was mean, abusive, and disparaging.
One day, in the heat of an argument, the father pushed the mother down a flight of stairs; killing her instantly. For his act, the man received a life sentence in prison.
During the funeral, the little boy spent most of the service standing directly in front of his mother's body. Inexplicably, as he stared down at his loving, nurturing mother, the boy found himself unable to cry. As hard as he tried, he could not produce one single tear.
The boy eventually grew up, graduated from college, obtained a successful career and started a family of his own; doing it all just to prove to himself that he didn't need his father. Building a strong hatred and resentment for his father, the man refused to allow his father any access into his life or the life of his family. For him, the grudge was rooted too deeply. One day, the man received news that his father died in prison. Though he vowed to himself that he would never allow his family to get involved with the father, his wife was able to convince him to attend the funeral.
At the ceremony, there was clear tension in the air. As the man approached the casket and looked down on his father, he was immediately reminded of all of the painful memories that were allowed to endure over the years. Suddenly, much to the man's suprise, seeing his dead father caused him to cry uncontrollably. While he was unable to cry for his loving mother, he cried for a man for whom he held a deep-seated hatred.
Is there a point to this story, you ask? I think there is. You see, the man became so consumed by the strong emotions that he had for his father (hatred in this case, but this could apply to anything), that once his father died, the man lost the one thing driving him. Essentially, he had nothing else to live for. He placed his hatred for his father above the love of his mother, his career; even his own family. His father's death left a void in his life that nothing else could fill.
Let this story serve as a warning: Do NOT put all of your eggs in one basket. If you do, and you happen to lose that basket, you'll live to regret it.