Most of our opinions are created by words and formulas, much more than by reason. It is not necessary to always defend the same opinion because no one can prevent becoming more wise. Those who approve an opinion, call it opinion; but those who disapprove call it heresy.
It is not very difficult to attack the opinions of others, but to sustain one's own: because human reason is so weak to edify, as a formidable battering ram to destroy.