Laziness is the one common deficiency in mankind that blocks the establishment of a perfect world in which everyone leads a happy life.
It is better to rely on yourself than on your friends.
If at first you don't succeed, try hard work.
He isn't a real boss until he has trained subordinates to shoulder most of his responsibilities.
Know and believe in yourself and what others think won't disturb you.
Once you have sold a customer, make sure he is satisfied with your goods. Stay with him until the goods are used up or worn out. Your product may be of such long life that you will never sell him again, but he will sell you and your product to his friends.