Someone once said that they enjoyed one of my papers, and that even though they thought the writing was very clear they still had to read it 3 times to understa

Someone once said that they enjoyed one of my papers, and that even though they thought the writing was very clear they still had to read it 3 times to understand it. I told them that I had to write it 100 times and spend two years before I understood it. So if they could pick it up in 3 readings over 3 days, they were doing pretty good.