When philosophy is wielded with arrogance and stubbornly, it is the cause for the ruin of many. Let philosophy scrape off your own faults, rather than be a way to rail against the faults of others.
When I was a boy of 14, my father was so ignorant I could hardly stand to have the old man around. But when I got to be 21, I was astonished at how much the old man had learned in seven years.