How hard do you try to keep your word when you give it to someone?
It's a tricky thing to do, in today's busy life, but it is terribly important.
When you keep your word, and follow through with whatever you said you were going to do, you are building your integrity.
While it is true that something may seem insignificant at the time, integrity is often built through small moments of truth. Moments when you can choose to do what's right, to be a person of your word, and to hold yourself to the standards you expect from others.