It all comes from one simple action.

Maybe....sometimes people need to be polite to each other so that their actions can influence the others for what they've done.
Maybe...sometimes people need to practice more the process of 'give and take' so everything won't be taken for granted - the people around them, the things they possess and the days that yet to come.
Maybe...sometimes you need to just pay attention to the people who are close and important to you and you'll find the little details that they never tell you in words. And maybe...those little details can make you realize how much you've lost them.
These are the simplest things in life but not much people are able to practice them everyday...
It all comes from only one simple action i.e. appreciate.