I just finished the Kindle edition of a very fine book entitled "Novice to Master: An Ongoing Lesson in the Extent of My Own Stupidity." The book was written by Soko Morinaga Roshi (1925 -1995) who was a Zen Priest of the Rinzai school. The book is filled with self-deprecating humor, and traces Morinaga Roshi's life from his early training to the time when he was an old man. There are many fine passages, but I liked this one in particular:
"The truly still mind, with which you were born, is the mind that moves freely. Without ignoring anything, it reacts wholeheartedly to everything it encounters, to everything on which it reflects. And yet, for all that, it is the mind that is never seized by anything, but is always ready to react on the spot to whatever it encounters next. The mind that is still is the mind that never forfeits its freedom and is able to constantly keep rolloing and rolling and rolling."
If you can find the time, I would recommend giving this book a reading.