Here are a few suggestions on how to accomplish that:
Don't contradict people, even if you're sure you're right.
Don't be inquisitive about the affairs of even your most intimate friends.
Don't underrate anything because you don't possess it.
Don't believe that everybody else in the world is happier than you.
Don't conclude that you have never had nay opportunities in life.
Don't be rude to your inferiors in social position.
Don't repeat gossip, even if it does interest a crowd.
Learn to hide your aches and pains under a pleasant smile. Few care whether you have an earache, headache, or rheumatism.
Learn to attend to your own business.
Don't try to be anything else but a gentle man or woman, and that means one who has consideration for the whole world, and whose life is governed by the Golden rule, "Do unto others as you would be done by."