Bitter zeal, or how schism is formed

A timely reminder from Rorate Caeli:

"Nothing is as important as simplicity and sincere mistrust of one's own judgment. If each one would be occupied with prayer, recollection, charity, disregard for self, and relinquishing a vain reputation of mind and knowledge, all disputes would be soon appeased...

What men create schisms and heresies? They are the intelligent men who are curious, critical, full of their own talents, motivated by a fierce and pharisaic zeal for reform, disdainful, unruly, and overbearing: they may possess right habits, a stern and haughty courage, a bitter zeal against abuses, a relentless dedication to study and discipline; but you will not find in them neither gentleness, nor understanding for neighbor, nor patience, nor humility, nor true prayer." 

 -- Fénelon