If you wait until you have to change, you may have waited too long.
If you turn your back on a customer, you turn your back on success.
Promise too much and you'll have plenty of room to fail. Promise little and you'll have plenty of room to excel.
To see like a customer, be like a customer.
Words not kept break more than a promise.
When only a little can be done, doing it becomes the greatest you can do.