It's good to do what you said you would.
Timothy partied late last night but promised his mother he'd mow her lawn today.
Timothy wants to catch up on some extra sleep.
Timothy rests a bit, then mows the lawn, then spends the rest of the day resting.
Timothy sleeps in bed all day and doesn't call his mom or mow the lawn.
Timothy's mom is happy and grateful to him.
Timothy's mom is upset and doesn't trust him as much anymore.