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.

Our ego may get in the way of finding the truth or the best course of action. In all that you do, try to be objective and remove ego. The aim and goal of decision should be to find the best course of action. If someone can prove or show a better way, then embrace it. But to dig in, entrenched in possibly faulty logic is absurd.

As for what you must do, simply perform your duty.

(see also Citadel p. 286)