I was unsure about defining this as I wanted people to come to the realisation on their own but here it is anyway.
“The more I learn, the more I learn how little I know.” – Socrates.
“The more I learn, the more I realise how much I don’t know.” – Albert Einstein.
“The more I learn, the more I realise that there is so much more to learn.” – Jeff Pine.
“The more you learn in any field, the more you realise that life is more about questions than answers.” – unknown source.
Let’s say I read a book and at the end I want to deepen my knowledge of said book.
I go to the bibliography and then find that the author has read, sometimes, 20 or 30 books on the topic.
So in order to learn all that the author has learnt I will have to read at least all the books that he/she has read.
The more learned you are, the more questions you can come up with.
So, the more I learn the less I know.