Okay, acknowledgement is not really a value. It's more of an action, but it has everything to do with the way you view the world and your relationship with other people.
My pastor used an illustration in his sermon today... you wouldn't walk into a dinner at the White House (assuming you were invited) and not acknowledge the President. He would be the reason you were at the White House, and the person who happens to live there.
Even though the people we come into contact on a daily basis may not have as much clout as the President of the United States, they still matter.
I work in a nursing home. I am deeply aware that just taking the time to nod or smile or say hello to residents I pass in the hallway is vitally important. Many of these people already feel discarded by their families, hopeless about their health, and live day to day going from medications to therapy to meals, and not much else.
If you want to make a difference in the lives of other people, start by making them feel like they matter. Listen to your spouse. Pay attention to your children. Say hello to someone you pass by on the street or in the hall.
Who can you make feel important today?