Hahaha what beauty you have, you have taught him very well and I do not say it because of his academic knowledge, but due to his relationship with the situation, that speaks a lot about him and about you, you have made it unequivocal. Tell him:
The wonderful thing about learning something is that nobody can take it from us
Wow, what a great quote. Thank you so much for the kind words, that was very nice.
Thanks to you for sharing that anecdote