For me, at least, there have been many things in my life that I've not understood until they were explained to me. Then I understood. It seems a person would never have the ability to learn a thing in life if the quote were true.
I do understand. I get real antsy when someone starts explaining something when I've already told them that i do understand it. Flip of the coin.....If I don't understand something and it's explained to me logically, I have a chance of understanding it.