Being able to quickly and deeply form personal relationships is a critical element to sales success. To this end, “How to Win Friends and Influence People” by Dale Carnegie is considered one of the seminal self-help books that have provided valuable lessons for salespeople and sales management. Its teachings still resonate today, even 77 years after it was first published. Here is a list of 20 of our favorite sales motivational quotes and sales leadership quotes from the pages of Carnegie’s classic.

1. “Don’t be afraid of enemies who attack you. Be afraid of the friends who flatter you.” – (Click to Tweet!)

2. “Talk to someone about themselves and they’ll listen for hours.” – (Click to Tweet!)

3. “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.” – (Click to Tweet!)

4. “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.” – (Click to Tweet!)

5. “Names are the sweetest, most important sound in any language.” – (Click to Tweet!)

6. “By fighting, you never get enough – but by yielding, you get more than you expected.” – (Click to Tweet!)

7. “Actions speak louder than words, and a smile says, ‘I like you. You make me happy. I am glad to see you.’” – (Click to Tweet!)

8. “Action seems to follow feeling, but really action and feeling go together; and by regulating the action, which is under the more direct control of the will, we can indirectly regulate the feeling, which is not.” – (Click to Tweet!)

9. “Only knowledge that is used sticks in your mind.” – (Click to Tweet!)

10. “To be interesting, be interested.” – (Click to Tweet!)

11. “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.” – (Click to Tweet!)

12. “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.” – (Click to Tweet!)

13. “The difference between appreciation and flattery? That is simply. One is sincere and the other insincere. One comes from the heart out; the other from the teeth out. One is unselfish; the other selfish. One is universally admired; the other universally condemned.” – (Click to Tweet!)

14. “Criticism is dangerous, because it wounds a person’s precious pride, hurt his sense of importance and arouses resentment.” – (Click to Tweet!)

15. “If some people are so hungry for a feeling of importance that they actually go insane to get it, imagine what miracle you and I can achieve by giving people honest appreciation this side of insanity.” – (Click to Tweet!)

16. “The chronic kicker, even the most violent critic, will frequently soften and be subdued in the presence of a patient, sympathetic listener – a listener who will be silent while the irate fault-finder dilates like a king cobra and spews the poison out of his system.” – (Click to Tweet!)

17. “Arouse in the other person an eager want. He who can do this has the whole world with him. He who cannot walks a lonely way.” – (Click to Tweet!)

18. “Winning friends begins with friendliness.” – (Click to Tweet!)

19. “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.” – (Click to Tweet!)

20. “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.” – (Click to Tweet!)