No one ever attains very eminent success by simply doing what is required of him; it is the amount and excellence of what is over and above the required, that determines the greatness of ultimate distinction.
If someone takes your coat, give him your cloak as well; if he makes you go a mile with him, go with him two. [Mathew]
— Bible
Here is the simple but powerful rule... always give people more than they expect to get.
Give the world the best that you have, and the best will come back to you.
I hate the giving of the hand unless the whole man accompanies it.
The man who does more than he is paid for will soon be paid for more than he does.
Always render more and better service than is expected of you, no matter what your task may be.
There are no traffic jams in the second mile.
The Extra Mile will have no traffic jams.