There are some people that if they don’t know, you can’t tell them.
Meaning of the quote
Some people are so stubborn that even if you try to explain something to them, they won't listen or understand. They'll only believe what they already know, even if it's wrong. This quote from the famous American musician Louis Armstrong means that you can't force someone to learn something new if they're not open to it.

About Louis Armstrong
Louis Armstrong was a legendary American trumpeter and vocalist who was among the most influential figures in jazz. His career spanned five decades, and he received numerous accolades, including a Grammy Award and inductions into several music halls of fame. Armstrong’s best known songs include “What a Wonderful World” and “Hello, Dolly!”, and he collaborated with other famous musicians like Ella Fitzgerald.
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More quotes from Louis Armstrong
Musicians don’t retire; they stop when there’s no more music in them.
American jazz trumpeter and singer (1901-1971)
If you have to ask what jazz is, you’ll never know.
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What we play is life.
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There are some people that if they don’t know, you can’t tell them.
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All music is folk music. I ain’t never heard a horse sing a song.
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We all do ‘do, re, mi,’ but you have got to find the other notes yourself.
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You blows who you is.
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There is two kinds of music, the good, and the bad. I play the good kind.
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The memory of things gone is important to a jazz musician.
American jazz trumpeter and singer (1901-1971)