Here are some best quotes from How to Win Friends and Influence People by Dale Carnegie

When dealing with people, let us remember we are not dealing with creatures of logic. We are dealing with creatures of emotion, creatures bristling with prejudices and motivated by pride and vanity.

If you aspire to be a good conversationalist, be an attentive listener. To be interesting, be interested. Ask questions that other persons will enjoy answering. Encourage them to talk about themselves and their accomplishments.

One thing only I know, and that is that I know nothing.

You may be right, dead right, as you speed along in your argument; but as far as changing another’s mind is concerned, you will probably be just as futile as if you were wrong.

PRINCIPLE 1 – Don’t criticize, condemn or complain.
PRINCIPLE 2 -Give honest and sincere appreciation.
PRINCIPLE 3 -Arouse in the other person an eager wanT.

It isn’t what you have or who you are or where you are or what you are doing that makes you happy or unhappy. It is what you think about it.
Here are some more quotes from How to Win Friends and Influence People by Dale Carnegie
“Don’t be afraid of enemies who attack you. Be afraid of the friends who flatter you.”
“You can make more friends in two months by becoming interested in other people than you can in two years by trying to get other people interested in you.”
“Any fool can criticize, complain, and condemn—and most fools do. But it takes character and self-control to be understanding and forgiving.”
“When dealing with people, remember you are not dealing with creatures of logic, but with creatures bristling with prejudice and motivated by pride and vanity.”
“Everybody in the world is seeking happiness—and there is one sure way to find it. That is by controlling your thoughts. Happiness doesn’t depend on outward conditions. It depends on inner conditions.”
“Talk to someone about themselves and they’ll listen for hours.”
“Actions speak louder than words, and a smile says, ‘I like you. You make me happy. I am glad to see you.”
“Personally I am very fond of strawberries and cream, but I have found that for some strange reason, fish prefer worms. So when I went fishing, I didn’t think about what I wanted. I thought about what they wanted. I didn’t bait the hook with strawberries and cream. Rather, I dangled a worm or grasshopper in front of the fish and said: “Wouldn’t you like to have that?”
Why not use the same common sense when fishing for people?”
“You can’t win an argument. You can’t because if you lose it, you lose it; and if you win it, you lose it.”
“To be interesting, be interested.”
“I have come to the conclusion that there is only one way under high heaven to get the best of an argument— and that is to avoid it. Avoid it as you would avoid rattlesnakes and earthquakes.”
“Why talk about what we want? That is childish. Absurd. Of course, you are interested in what you want. You are eternally interested in it. But no one else is. The rest of us are just like you: we are interested in what we want.”
“Control your temper. Remember, you can measure the size of a person by what makes him or her angry.”
“The deepest principle in human nature is the craving to be appreciated.”