Recently, I challenged myself to read as many biographies of our American Presidents that I could find to read or to listen via audio books. I find it an interesting quest. Perhaps you should try it.
This afternoon it occurred to me that biographers lean heavily on existing correspondence to form history. Washington and his wife burned all of their personal correspondence, as did Thomas Jefferson and his wife, Patty. There is a plethora of letters that have survived and notable biographers draw from them endlessly.
Before I read of Washington and Jefferson (currently) I read of Dwight Eisenhower. Much of the history was gained and is preserved in his Presidential library and his letters include letters to his wife Mamie. However, in reading the book, 41: A Portrait of my Father, Bush does not lean heavily on letters. They do exist because George H.W. Bush was a prolific letter writer and persistent in writing handwritten thank you notes of appreciation.
Texting, e mail, and messaging are not going to be preserved for posterity. (Ask Mrs. Clinton.) It may be convenient, but a handwritten document takes thought, time; it is a piece of yourself.
This leads us to the Apostle Paul, and others of the early church. Peter, James, John, Jude, Philemon all give us details of how to conduct oneself in holy living. I cannot begin to imagine not having the Bible without these instructions given to us in obedience to prompting of the Holy Spirit.
I have said it before and say it again now, handwrite observations in a journal. You may not think you are famous or will ever become famous, but I can tell you that someday a relative will light their eyes on your scribbling with joy. They can listen to your heart though it lies silent in the clods of earth.