“You have not lived a perfect day, unless you've done something for someone who will never be able to repay you.”
“You cannot live a perfect day without doing something for someone who will never be able to repay you”
“You can't live a perfect day without doing something for someone who will never be able to repay you.”
“You can’t live a perfect day until you do something for someone who will never be able to repay you.”
“You have not lived today until you have done something for someone who can never repay you.”
“to be angry at someone they have to have done something to upset or hurt you, and to be able to upset or hurt someone means you having to have meant something to them in the first place.”