Every bitter has extreme high level of hidden sweetness in his inside.My experience says, bitter people are,if revealed, can prove thousand times more sweeter than ,generally renowned Sweet People.These bitter people have tremendous quality to give any thing to their loved ones but they never show off.Generally they are always less cunning than sweet spoken people.Once they start loving somebody they never deceit ,whom they love.Few or lot of people speak sweet, lovely but contain deadly poison in their hearts for others. Suppose, if bitter would not have been there,who would have appreciated sweetness?