Commentary on Meditations: B6:21-22

If someone can prove me wrong and show me my mistake in any thought or action, I shall gladly change. I seek the truth, which never harmed anyone: the harm is to persist in one's own self-deception and ignorance.

I do my own duty: the other things do not distract me. They are either inanimate or irrational, or have lost the road and are ignorant of the true way.

These two passages really don't need much commentary.  They stand on their own. 

In sum; seek and take feedback and do your duty.

(see also Citadel p. 286)