1) K'ung Fu-tse (mispronounced "Confucius") - considered life to be sour. He felt that the world was a disorderly place, which had to be controlled.
2) Buddha - considered life to be bitter. He saw the world as full of pain and illusion, full of attachments and traps. He felt that we must work spiritually to rise above these things.
3) Lao-tse - considered life to be perfect & wonderful as is. He saw a natural harmony that could be experienced by anyone at anytime. He believed the world to be a teacher of valuable lessons, and that we should embrace the wonder of every moment.
--from the Tao of Pooh by Benjamin Hoff--