I do not know the author of this statement, but I love it.
"The mind that opens itself to a new idea can never return to its previous size."
I fell in love with that statement the first time I heard it.
Sounds good, but I'm too old for this now
One should never be too old to learn.
@Petter I have known teenagers who have refused to learn and nonagenarians who love learning.
@anglophone Every time I think I know everything, some sod invents something new!