“Wear the old coat, buy the new book.” – Austin Phelps
Austin was an American minister and educator from Massachusetts. He has written many theological text books (many of which still have printings) but may not be known outside of theology studies. As far as I can tell, his most widely known statement may be the one quoted above.
Lesson: I decided to choose this because I think that at face value, the statement is perfect. It tells you that you should forego newer nice-to-haves in order to pursue knowledge. However, I think it is a bit deeper than that. I have drawn the lesson that we should not give up on what we have which will then enable us to pursue knowledge.
The difference may be subtle, but it stands up in my mind.