I had to impart the following bit of wisdom learned on a kid who just never seems to follow through on his promises:
Someday you’ll be driving a nice car and living in a nice house, but you know what one thing is worth more than all those other things? Your word. People will judge you more on your word and whether you kept your word than all the material possessions you can ever own.
I didn’t have the chance to break out with a diagram at the time, but I add one now for illustrative purposes: