Writing in a journal reminds you of your goals and of your learning in life. It offers a place where you can hold a deliberate, thoughtful conversation with yourself.
As a graduate student, I wrote a long paper connecting the dots between mathematical models of learning and language development in children. It was published in a major journal.
American Society for Psychical Research Journals were all around the house when I was a kid.
Learning never exhausts the mind.
Leonardo da Vinci