Reverend Parris has many enemies because he is self-righteous, egocentric, and self-concious. As the town's Reverend, it is his job to encourage and promote religion. However, Parris goes out of his way to scold those who don't make attending his sermon a weekly occurence. Therefore, instead of bringing together unity among the good people of Salem, Parris ostracizes moral, hardworking men like John Proctor, whose only fault is that his dedication to his farm often overlaps into what Parris believes should be Sunday's day of rest and churchgoing.
Parris also feels insecure about his position in the community. He thinks all should praise him, for he is the one who does "God's work" and is, therefore, someone who should be treated with the highest reverence. He becomes defensive when people start questioning his value to the community and church when they point out the perk of the free firewood he gets for being reverend in addition to his salary. This inconsistency with his own self- importance and the importance others hold for him causes turmoil between Parris and other citizens of Salem.
Finally, those who get to know Parris well can see he is concerned about what others think about him more than anything else. This is what causes him to believe Abigail's lies when she clearly is only trying to get herself out of trouble by focusing the blame on others. Parris is not even willing to see the possibility in that because he is afraid of what people would think if an instance of witchcraft occurred inside his own home. His greatest fear would then come true; his reputation would be ruined and his career would be over. This causes him to come at odds with several law abiding citizens, such as the Nurses and Coreys, whom Parris refuses to support when they are accused of being involved in witchcraft.