Quotes from How to Win Friends & Influence People (Revised Edition) by Dale Carnegie:
Chapter: How To Interest People.
Principle: Talk in terms of the other person’s interest.
“Everyone who was ever a guest of Theodore Roosevelt was astonished at the range and diversity of his knowledge. Whether his visitor was a cowboy or a Rough Rider, a New York politician or a diplomat, Roosevelt knew what to say. And how was it done? The answer was simple. Whenever Roosevelt expected a visitor, he sat up late the night before, reading up on the subject in which he knew his guest was particularly interested. For Roosevelt knew, as all leaders know that the royal road to a person’s heart is to talk about the things he or she treasures most.” (pg. 94)
Principle: Talk in terms of the other person’s interests.