Quotes about dignity principles

If you must disagree, disagree with dignity - Dale Carnegie
At its core, this quote means that the how of your disagreement is just as important as the what. It's about separating the idea from the person and attacking the problem, not the individual.

Wise advice on correction

Let the other person save face when you correct a mistake - Dale Carnegie
At its core, it means protecting a person's dignity and self-esteem even when you have to point out their error. It's the art of correcting the mistake without annihilating the person.