In my work, I always try to follow through. The value of this seemingly simple thing is often overlooked. When you say that you are going to do something, do it! The people around you are counting on this in order to complete their tasks. The hidden benefits are also clear. People will grow to respect you and cherish this value in you. They know that they can always count on you and that is priceless.
When you say that you will take care of something, write it down, make a note, add it to your calendar. Whatever way you can remember it, just remember it! It will pay back dividends.
