What book is the phrase "The essential is invisible to the eyes" from?

What book is the phrase “The essential is invisible to the eyes” from?

January 7, 2015 No Comments yet Posted in: Trivia crack answers

Question: What book is the phrase “The essential is invisible to the eyes” from?

Options:

The fault in our stars

The little prince

The last song

A walk to remember

Correct answer:

The little prince