What we think, we become. What we believe, accept, and dwell upon becomes a part of our being. We can focus on excellence in everything we do, from the grocery store to the drive-thru. We don't need to be Mother Teresa; small things matter, too.
There are lots of people who are looking for a really great spiritual teacher. They think that someone else can teach them, but it isn't true---we teach ourselves. We are equipped with everything we need. We cannot change anyone else---only ourselves. Put down what others are struggling with, and make peace with it.