"I advise my students to listen carefully the moment they decide to take no more mathematics courses. They might be able to hear the sound of closing doors- James Caballero." "Everyone is a Mathematician CAIP Quarterly 1989*
Well, not exactly
It's better written this way in my version:
My advice to everyone is never stop learning; what that means is continuously improve the mind in professional skills, people skills, and outlook. When you decide you've learned all there is worth knowing, you may be able to hear the sound of closing doors.*As quoted by Glen Alleman
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