The Most Important Characteristic of the Well Mannered Adult

...is a teachable spirit.

As children we are (hopefully) taught manners, and how to interact and share with others.  But over the course of time, and perhaps in given situations, we need a bit of retraining to behave properly toward other people.

For that, we must be teachable.  If a person believes they were through with being taught once they emerged from childhood, they are over-looking the fact that we humans are a work in progress---teaching and correction are part of our lives.  Who hasn't received a speeding ticket or some other traffic violation--a reminder that there is a speed limit or other law for a specific reason?

Be teachable.  Be open to gentle correction.  Be willing to grow into a better human being.