friar- begs on the behalf of the poor; while parson - poor but rich in holy thoughts and deeds.
Chaucer looked at the faults of the Friar and noted that certain things might cause a religious person to stray. Four of these things were materialism, gluttony, bribery, and mistruths. The Friar is of course guilty of all of these things in one degree or another. He's fat (gluttony), he loves horses and fine dogs for hunting (materialism), and he enjoys being a man of the world far more than he enjoys leading his flock.....
Chaucer's Parson however....... he is the exact opposite. The Parson leads by example and believes that the most important thing he can do is follow the path Jesus set. He believed that he was responsible for the moral well-being of the common people, and that without him..... some might not make it to the gates of Heaven.
