Intelligence is useful. Energy is valuable. Integrity is essential.
If your customers are demanding, be thankful.
Let your customers say, 'Well, here I am,' while you say, 'There you are!'.
The bottom line is a by-product of taking care of your main product - your customers.
Unlimited efforts can produce unlimited results.
When customers' expectations change faster than your willingness or ability to serve them, you can be sure they'll be someone else's customers soon.