Bitterness is sad, pathetic but sometimes, inevitable. For a creative person, its like poison. It kills the artist in you, depriving you of the tranquility you so badly need for synchronizing your thoughts. For the cheerful and dreamy human being its a sad reminder of the thorns which one needs to fall on in life and how! But for the wise soul, its another opportunity to assess the world around and drain out the bitter potions that deter one's growth as a happy, complete, satisfied individual.

P.S.- And here you have a new preacher in the making! ;)